Tag Archives: toys

Merry Christmas from Tesla

December
24
,
2021
| 0 Comments

I just received a software update for my Tesla Model Y today – just in time for Christmas.  Among many other changes and additions, it now includes the light show for all of their current models.  As a friend noted, it appears to be possessed by a ghost of Christmas:

Apparently it’s now possible for owners to create and load new light show arrangements.  The provided one is set to the tune of Carol of the Bells.

Update (12/27): As expected, folks are already making tons of new song and light show arrangements, like Eye of the Tiger, Star Wars Imperial March, Darude’s Sandstorm, Daft Punk “The Grid” from Tron: Legacy, etc.  Here’s a repository coming together to find and download them.

If you’re interested in buying a Tesla, using someone’s referral link will give you a discount (the amount varies over the years) and grants redeemable credits to the person who referred you.  Here’s my Tesla referral link.

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The Unistellar eVscope

February
13
,
2020
| 13 Comments

I received my eVscope from Unistellar in January of 2020 and I thought I would share my thoughts and experiences with it – particularly since there wasn’t a lot of info available when I ordered it in back in July of 2019.  I’ve since been adding to this page to provide additional information.

Overview

The Unistellar eVscope is quite different from a traditional optical telescope.  It’s a highly integrated and automated digital imaging telescope that enables you to easily find and view deep sky objects in color and detail that would not normally be perceptible to your eye looking through a normal optical telescope.  In addition, the eVscope is designed to let you easily participate in and contribute data to crowd-sourced “citizen science” projects.

The eVscope is a 4.5-inch Newtonian reflector that captures light on a highly sensitive, low noise Sony IMX224 color sensor while using a motorized alt-az tracking mount and autonomous field detection to automatically identify, align and continually track its view of the sky.  Integrated image-processing software takes and combines an on-going series of short exposures to generate an image in almost real time that brings out much of the very low light, color and detail that’s not visible to the human eye even when looking through a normal telescope. This view accumulates over just seconds and minutes and is displayed both in the telescope’s eyepiece (on an OLED display) as well as on a WiFi-connected smartphone.  The whole thing is self-powered via an integrated 9-10 hour rechargeable battery, fits into a large backpack and weighs just under 20 lbs. including the provided tripod.

In other words, it’s quite an impressive level of integration!

While you can of course outfit a normal telescope and tracking mount of your choosing with the necessary cameras, computer, tracking and image stacking software, WiFi connectivity, battery power, etc., you then also have to develop the expertise to use and troubleshoot this software – and it’s not trivial. To be clear, the eVscope is not really designed to be a sophisticated imaging tool or to compete with the results you can eventually get with lots of practice and expertise and many hours of capturing and processing images.  Instead, the eVscope is intended to let you very easily see and enjoy much more detail than you can with a normal, unaided telescope and it provides quick setup, ease of control from your smartphone, and a fun, real time viewing experience all wrapped up in a lovely, convenient little package.

It is however not cheap to integrate all these components into such a convenient package.  As such, I wouldn’t recommend it for someone wanting to dip their toe into astronomy on a small budget.  It’s pretty clear though that this makes for a wonderful tool for astronomy outreach programs anywhere and I’m really looking forward to sharing the experience with friends and their families.

Setup and Use

I recorded a video to demonstrate the ease of setting up and using the eVscope:

I forgot to record using the focus ring on the base of the scope, so perhaps I’ll add that later, but Unistellar provides a nice page detailing how to use it with the provided Bahtinov mask: How to use the Bahtinov mask?  (It’s great how the mask is integrated into the cap!)

With the earlier version of software (version 0.9), I did encounter a lot of bugs but most of these have already been addressed in version 1.0 (April 2020).  And now it’s performing even better in version 1.1 (October 2020).  They’ve also made many improvements over just this year and added functionality that makes the eVscope an even more fun and amazing experience to share with people.

The ease of setup and the speed with which you can get to viewing objects is great.  I really like the convenient size of the thing, including the integrated power supply and the optional padded backpack to carry and protect it.  The initial star alignment process is super fast (around 30 seconds) and it’s autonomous field detection system seems to do a great job of tracking the sky and dealing with field rotation over several hours.  I did find the views appear slightly soft (presumably from the effort to track, align and integrate frames over many minutes) but still quite enjoyable, and perhaps this will improve with future updates.  You can see some sample images below.  I should note that I haven’t tried collimating the scope yet, so I’ll update here when I get the chance.  Update (April 2020): I finally had both time and a bit of clear weather to collimate the telescope and it turns out it was off a little but now well aligned.  Over time I’ll try to replace all the images in the gallery with new ones post-collimation.  So far it’s just the last few in the gallery that were taken after collimation. (Whirlpool Galaxy, Ring Nebula, Eagle Nebula)

Another aspect of the very quick and easy setup is that it takes less than a minute to pull out the scope on a whim, stand it up on the open patio outside my bedroom, remove the cap, turn it on and dash back inside out of the cold winter night, and settle in with my phone or iPad and mess around exploring the sky, in warmth and comfort.  I definitely cannot set up and align my 8” SCT and german equatorial mount so quickly and easily even with the auto-align accessory, plus there’s setting up cameras, laptop, myriad power and USB cables, etc.  Not to forget to mention the disassembly and take down time afterwards again!

That said, I don’t think you should think of the eVscope as astrophotography gear. Everything is integrated to make it easy to observe deep sky objects with color and detail you can’t see without the aid of sensors, but it does not provide the means to capture frames and do your own stacking or more sophisticated and detailed imaging with a non-color sensor and color filters, etc. I would not expect this telescope to compete with custom gear where you have control over everything (and of course have to learn how to do everything). That is not the purpose of its design. Similarly, the cost reflects the benefits of integrating all these pieces (sensor, tracking software, stacking/imaging software, display, power supply, etc) into a small and elegant package without any cables or separate components to manage while also making it dead simple to use. That’s what you’re paying for and that’s the trade-off.

As of February 2020, the provided documentation was pretty good in some areas but a little weak in others. For example, I was surprised how long it took me to find a little blurb buried in a list at the back of the printed guide that explained how to tell if the battery was fully charged.

As of May 2021, the provided online documentation is much improved.  I don’t know what has changed with the printed instructions since I received my scope back in January of 2020, but there’s plenty of information now available from their online knowledge base and more and more questions are getting answered over time.

Citizen Science

As I mentioned above, the eVscope is also designed to participate in crowd-sourced “citizen science”, in partnership with the SETI Institute.  As per their web site, the eVscope “allows users around the world to participate in observing campaigns to image and collect data on objects of special interest to researchers.  In Campaign Mode, image data is automatically sent to a data repository at the SETI Institute’s headquarters in Silicon Valley. The international scientific community can then access unprecedented volumes of image data for specific objects, from thousands of telescopes around the world, at different dates and times. This in turn, can enable new discoveries and enhance our understanding of the universe around us.”

In early February 2020, I had the opportunity to participate in one of these observing sessions.  I received an email providing instructions for a particular target and observing time to collect data on an exo-planet transit of “WASP-43b”.  The procedure involved setting up beforehand, selecting and confirming the target and then starting the Enhanced Vision capture process and letting it run autonomously for several hours as it tracked the target.  Afterwards there was the capturing of 30 seconds of “dark frames” and then initiating the download of data from the telescope followed by the upload to their servers.  While I encountered a few issues along the way (included in my bug list below), it was fun to get to participate in a data gathering session like this.

Here’s a more recent example of results from a “citizen science campaign” I was able to participate in. This was an effort to detect occultation by a Jupiter Trojan asteroid (“Palinurus”) on May 27th, 2021:

Sample Views

Here’s a couple of real time recordings of the Unistellar app showing the live view from the eVscope of the Orion Nebula (over 3.5 minutes) and Bode’s Galaxy (over 6 minutes):

       

Here are some images illustrating the views you can generate and enjoy in just minutes with the eVscope.  I’ve included both screenshots of the full image displayed on my phone as well as the circular cropped image that it produces for display in the eyepiece and that it allows you to save from your phone.  (The eyepiece shows only the circular cropped image and it does not display the descriptive text or circular outline.) I have not done any further processing on these images – these are just as they were originally generated by the eVscope app or screenshot-captured off my phone. (Originally, the eVscope app would only save the circular cropped version, but now the app will let you save the full uncropped version.)

The Sony IMX224 Exmor CMOS color sensor used in the eVscope has a resolution of 1305 x 977.  The images saved from the eVscope app are 1280 x 960 and the circular cropped images are 1080 x 1080.

Click on any image below to see the full size version and to browse the gallery:

Flame Nebula NGC 2024

Running Man Nebula NGC 1977

Bode’s Galaxy M81

Orion Nebula M42

Eagle Nebula M16

Andromeda Galaxy M31

Whirlpool Galaxy M51

Lagoon Nebula M8

Eastern Veil Nebula, NGC 6992

Ring Nebula, M57

Original eVscope For Sale

I’ve decided to upgrade to the newer eVscope 2 and so my original eVscope is now up for sale.  I’m asking $2000, including the Unistellar backpack.  Contact me via email: (chris “at” crimdom “dot” net).

Feature Requests

It’s really great that Unistellar is obviously listening to its users and has been steadily improving the software for the eVscope.  Many of my own issues and feature requests have already been addressed.

Here’s my feature requests as of May 2021 (both current and previously implemented), using version 1.3 of the Unistellar app, running on iOS 14 (iPhone 12 Pro and an iPad Pro):

PLEASE NOTE: There’s been a lot of changes to the app which, as of November 2022, is on version 2.1.  I haven’t spent much time with it yet so probably all of these notes are out-of-date now.

  • Enhanced Vision for bright planets: Would it be possible to provide the ability to automatically select and stack very short exposures (only 100’s of milliseconds) when imaging very bright objects like the planets Mars, Jupiter and Saturn?  Currently, Enhanced Vision only operates with very long exposures – obviously necessary for dim, deep sky objects.
  • More Enhanced Vision improvements: Would it be possible to improve the Enhanced Vision processing to better deal with highlights?  Currently all the brighter stars in a field quickly develop into very over-exposed(?), large solid balls.  Perhaps there’s some more finesse that could be done automatically to improve or retain the dynamic range when combining exposures?  Or perhaps provide access to some more advanced exposure controls?
  • Allow information overlay on saved images separate from cropping option: As of version 1.0, you can now choose to save the full, uncropped, undistorted image by choosing to not apply the “image overlay” option under General options.  However, this also removes the useful information text like the object name, exposure time, location and date which would often still be nice to have appended along the bottom of the image.  I suggest that the cropping option and the information overlay option be separate options.
  • Goto support via SkySafari: Would be wonderful to be able to use SkySafari to browse, select and go to targets with the eVscope (as you can with many other telescopes/mounts), as well as to be able to easily see and explore where the scope is currently pointing.
  • Fix “Do not show again” message: This is the message that displays after the message to confirm whether you’d like to save the currently generated image when exiting Enhanced Vision mode.  Two things here: 1) Change that message to “Do not ask again?” which is less awkward and easier to understand what you’re referring to and 2) please stop asking every bloody time!  Once (or at most, once per session) is enough.  If I answer “Yes” that I want to have the confirmation to save, that means “yes, I do”.  So please stop reconfirming over and over again.  You provide the option to turn off the save confirmation in preferences and that’s enough.
  • Display useful status/info: Please provide more status info in the app like current sky coordinates and battery charge state estimate.  (The coordinates are only currently available after the fact in the saved images. There is now a battery charge state icon – no percentage estimate, but still useful – and Enhanced Vision mode now displays elapsed exposure time.  Thank you for that!)
  • “Picture was saved” notification interferes with usage of the app:  (I need to verify whether this still happens in version 1.1.)  After saving an image, a little notification appears at the bottom across the modal tab buttons for a couple of seconds, forcing you to wait until it disappears.  Please move this message elsewhere where it doesn’t get in the way and/or reduce how long it’s displayed.
  • Improve catalog display: The current style of displaying catalog items as a grid of large icons requires that the object names often be truncated.  Also, the large generic icons to indicate the type of object aren’t a great use of the available space.  How about a list-oriented view (and a smaller icon) to make better use of the screen real estate?
  • Shared WiFi connectivity: Would be nice to be able to optionally configure the eVscope to use an available WiFi network instead of its own WiFi so as to 1) support extended WiFi reach, 2) allow devices to access both the internet and the telescope simultaneously, and 3) to avoid the need to always switch to the telescope’s WiFi.

These options or features are now available:

  • IMPLEMENTED – More expansive view through the eyepiece: Unistellar has now announced the eVscope 2.0 which, among other things, now includes an apparently improved eyepiece and display.  I haven’t seen it personally but it sounds like they’ve tried to address this.I’ll leave my original request here:
    I can see that the design of the eVscope was to very much provide an optical, telescope-like viewing experience – which is of course why there is an eyepiece on the scope at all.  However, I think it is a mistake to not maximize the apparent field of view in the eyepiece to provide more of a grand and wondrous view.  To that end, I wonder if you could use a different lens with the eyepiece to really open up the apparent magnification and field of view of the image you’re able to generate.

Currently you see a small constrained view far down the end of a tube.  You should really try to shoot for a big gorgeous panoramic view, a “spacewalk vista”, like what you get with TeleVue’s fantastic, wide apparent field eyepieces.  Could you simply make use of the same kind of optics and/or display technology inside the electronic viewfinders that Sony and other camera manufacturers use in their digital SLR cameras?  These digital display viewfinders do a fantastic job of enlarging the apparent view on these tiny little displays.  They’re a joy to use and provide a much larger, clearer, detailed view than you get from the displays mounted on the backs of these same cameras.  I realize this would require a hardware change but oh, what a view that would be!

Along these same lines, could there be a way to make use of the full uncropped image in the eyepiece?  With relatively large targets, the uncropped view on the phone’s display is much more expansive and enjoyable than the much constrained circular cropped view.  Could there be a way to present the full uncropped rectangular view and allow it to be rotated in the eyepiece to deal with changes in the telescope’s orientation?

  • IMPLEMENTED – Simplify data upload procedure:  This is not something I thought to ask for, but I want to call it out as it’s a very nice improvement.  As of version 1.3, you now just click an “Upload Data” button and the eVscope will park the scope, connect to your available WiFi network and directly upload its data before eventually shutting itself down.  You no longer have to go through a tedious transfer process to your phone and then again to upload it to their servers.  Very nice!
  • IMPLEMENTED – Send Observation Parameters: As of version 1.3, there is now a mechanism to load observation parameters into the app by merely clicking a link/URL.  This is very nice to see and use, thank you!  Given the eVscope’s ability to participate in “citizen science” observations and data collections, it seems like there should be a more direct way to send observation parameters (like RA/Dec coordinates and exposure/gain settings) to the scope from an emailed observation request.  Perhaps encoded in a URL that’s interpreted by the Unistellar app?  It’s kinda silly that you have to transcribe lengthy coordinates from an email on the phone to the Unistellar app on the phone.  You can’t even copy/paste right now!
  • IMPLEMENTED – Option to save full, uncropped image: As of version 1.0, there is now an option to choose between saving the full frame image or the circular cropped version with the info.  Yay!!  However, it would be nice to get the textual info with the full uncropped version too.  Currently there is only an option to save or share the circular cropped image.  It’s both heavily cropped and mildly distorted around the edges to give it a sort of eyepiece lens effect.  Please provide a built-in option in the app to save the full uncropped, undistorted image!  I should not have to go to the trouble to capture a screenshot of my phone and manually crop it to get the full image.
  • IMPLEMENTED – Allow panning of zoomed view in the app: You can now pan around when zoomed in on the current image in either Live View or Enhanced Vision mode.  It works really well and smoothly and shows your current zoom level.  The app display’s zoom feature currently only zooms into the center of the image.  You can’t zoom in anywhere else in the image.
  • IMPLEMENTED – Allow image save during live sky view: As of version 1.1, you can now save an image based on the current live view, not just an Enhanced Vision view.  The option to save an image is only enabled during the Enhanced Vision mode, not during live sky view.  This would be useful for very bright objects (like the moon and planets) when Enhanced Vision mode doesn’t produce useful results.
  • IMPLEMENTED – Dedicated iPad version of app: As of version 1.1, the iPad version of the app is no longer merely a scaled up version of the phone app.  It now uses the whole screen and takes advantage of all the additional screen real estate.  It looks and works really well and is definitely now my preferred device for working with the eVscope, given the much larger display.  The current iOS app is just scaled up from the phone version on the iPad and does not take advantage of all the additional screen real estate.  The iPad would be an even better platform for viewing/controlling the eVscope if the available space were well utilized.
  • IMPLEMENTED – Display useful status/info: As of version 1.1, Enhanced Vision mode now displays elapsed exposure time. They’ve also added a calculation of remaining time that a given object will be visible in your sky view.  As of 0.9.3, there’s now a battery charge state icon.  No percentage estimate, but still useful.
  • IMPLEMENTED – Improved data upload process: As of version 1.1, they now have changed how the upload data process works: You now provide your internet-connected WiFi credentials to the eVscope, press a button and the telescope performs the upload directly to their servers, without further involvement from your phone or tablet.  And it will optionally park the eVscope and shut it down when it completes the process.  This is a great improvement over the old, incredibly slow download to phone then upload to internet process.
    Why are the download/upload functions so incredibly slow??  Even over local WiFi from the telescope to the phone?  How many gigabytes could that possibly be? I don’t have enough storage on my phone for it to take that long. Is there a bug here?
  • IMPROVED – Allow interaction with other controls when picture adjustment controls are present: As of version 1.1, a simple tap into the image display area will dismiss the controls so it’s not as annoying as it used to be.  Might still be worthwhile to change the interface design so that the picture adjustment controls don’t prevent interaction with the display area.  This could be accomplished by making the bottom area into a tabbed interface, so you can switch between info display, adjustment controls, etc.  Showing the picture adjustment controls (gain, exposure, contrast, brightness) blocks the ability to zoom the image or save it.  I find this inconvenient since I’m always making little tweaks to these controls and want to zoom in or out and save the image in between the adjustments.
  • IMPLEMENTED – Finer positioning control: As of version 1.1, this has improved.  Short taps on the directional arrows does now seem to provide small enough movements of the scope to more easily adjust your view.  Currently, the smallest possible position adjustment is with a single quick tap on the directional arrows around the joystick control but this still moves objects in the display about 1/6 or so across the field of view.  In other words, it’s not possible to move the scope by a smaller amount.

Issues / Bugs

PLEASE NOTE: There’s been a lot of changes to the app which, as of November 2022, is on version 2.1.  I haven’t spent much time with it yet so probably all of these notes are out-of-date now.

As of May 2021, these are the issues I currently see on version 1.3 of the Unistellar app for iOS 14 (iPhone 12 Pro and an iPad Pro):

  • While waiting for the start time of a scheduled “citizen science” observation event, I’ve had the observation parameters (coordinates, gain, exposure time, etc) get cleared after returning to the Unistellar app.  I was able to switch in an out several times over 5-10 minutes and not lose the loaded parameters but then, one minute before the start time, all the settings were cleared out and reset.  Worse, selecting the link to reload the parameters didn’t work!  I had to quickly force quit the app and relaunch it to get the observing parameters to load again.
  • While scrolling through the catalog list, the display will frequently and seemingly randomly jump back to an earlier point in the list – forcing you to have to try to find where you just were again.  Annoying!

The following issues all seem to be addressed – or at least haven’t happened again yet as of the given version.

As of version 1.3:

  • The Unistellar app has trouble reconnecting to the eVscope while Enhanced Vision is still processing after temporarily switching out to another app.  It can take several false starts before you regain control of the eVscope after switching away and back.
  • I’ve had the Enhanced Vision mode hang up after an extended run (28 minutes).  The elapsed time stopped updating (stuck at 28 minutes) and while I could still interact with the app, any pictures adjustment changes would not apply and the controls would just jump back to where they were.  I had to exit Enhanced Vision mode to get things working normally again.

As of version 1.1:

  • Sometimes lots of large random distortions and smears of light and color appear in the display. (I’m not talking about while slewing which would be expected.)

As of version 1.0:

  • The gesture to pinch zoom is buggy and at times it jumps around or refuses to stick.  Strangely, at other times, it works just fine.  I haven’t picked up on a pattern as to when it doesn’t work.  As of version 1.0, this is working much better.  It can still act a little wonky at times but it’s much better.  As of version 1.1, it’s working great and allows you to pan around the zoomed image.
  • The app will immediately crash/exit when you return to the app after being disconnected from the scope or wifi or after having to leave the app for some reason and come back.  The app will also occasionally crash/exit for other unknown reasons in the midst of using it, but I haven’t tried to maintain a list of each circumstance.  Hopefully you’re receiving the iOS crash reports from Apple.
  • I’m seeing a patch or trail of green pixels on most images in the same place.  I’m guessing I’ve got a hot/stuck pixel on my image sensor and the random walk pattern of the pixel is just the effect of combining many images as the field shifts and rotates while tracking the target.  Is there support for subtracting out hot/stuck pixels?  As of version 1.0, the “Take Dark Frame” action also results in removing any stuck pixels from the eVscope’s imaging.
  • Adjusting the contrast/brightness controls while enhanced vision running usually results in the slide control jumping back to its previous position while it completes current frame, and only then it jumps to where you set it.  If you don’t realize it’s going to do this, you’ll try to move it again and again and only get even more confused as to why it keeps jumping around.  It needs to at least stick in the new position even though the next frame is still being generated.
  • On one occasion, the joystick/slew buttons seemed to stop working but after quitting and relaunching the app I found that it had actually slewed but had apparently stopped updating the displayed view.
  • On another occasion, the joystick slew buttons stopped working and the scope view began shifting randomly.  Had to quit/relaunch the app to fix it.
  • Another time the app got stuck in a goto/skewing operation and none of the buttons worked any more and I couldn’t select another target.  The telescope seemed to be no longer tracking the sky, the star field just drifted in the display.  Force-quitting the app didn’t help.  I had to power down the telescope and restart it.
  • Seems like the app or the telescope gets confused if you exit the app while enhanced vision mode is engaged.  Are you supposed to be able to exit and come back while enhanced vision is in progress?
  • Often the app will forcefully halt the enhanced vision mode without warning and without a chance to save what you have so far – it just returns to the live view.  Sometimes there is no message at all and other times there will be an error message like “too bright” even when it appears there is still much more light that could be captured over most of the frame: only a couple of bright stars in a large field of dim nebula, before the nebula has even really become visible.  Please don’t forcefully stop!  (Also, how is it that we were instructed to leave enhanced vision mode running for hours during the recent exo-planet transit when I have had it quit after just 10 minutes or so on a nebula??)
  • I found that both the download and upload sequences would sometimes stop processing after many minutes and I would have to quit and restart them.  This happened several times (4-5 maybe?).
  • On a couple of occasions, the “goto” catalog list would jump or reset its scroll position while trying to scroll through it making it difficult to select the desired item.  Usually it’s fine – I haven’t figured out when this happens yet.
  • Please rework how those three sequential messages work asking whether to automatically save the image after running enhanced vision.  It was frustrating trying to get it to just prompt me to save the image without also asking me two follow-up questions every time.
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Unistellar eVscope

February
05
,
2020
| 0 Comments

I recently received my eVscope from Unistellar and after just a few sessions with it, I thought I would share my thoughts and experiences with it so far – particularly since there wasn’t a lot of info available when I ordered it in back in July of 2019.

Overview

The Unistellar eVscope is quite different from a traditional optical telescope.  It’s a highly integrated and automated digital imaging telescope that enables you to easily find and view deep sky objects in color and detail that would not normally be perceptible to your eye looking through a normal optical telescope.  In addition, the eVscope is designed to let you easily participate in and contribute data to crowd-sourced “citizen science” projects.

The eVscope is a 4.5-inch Newtonian reflector that captures light on a highly sensitive, low noise Sony IMX224 color sensor while using a motorized alt-az tracking mount and autonomous field detection to automatically identify, align and continually track its view of the sky.  Integrated image-processing software takes and combines an on-going series of short exposures to generate an image in almost real time that brings out much of the very low light, color and detail that’s not visible to the human eye even when looking through a normal telescope. This view accumulates over just seconds and minutes and is displayed both in the telescope’s eyepiece (on an OLED display) as well as on a WiFi-connected smartphone.  The whole thing is self-powered via an integrated 9-10 hour rechargeable battery, fits into a large backpack and weighs just under 20 lbs. including the provided tripod.

In other words, it’s quite an impressive level of integration!

Continue reading »

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X-Wing / Tie-Fighter Dogfight

December
12
,
2019
| 0 Comments

Glenn and I took his x-wing and tie-fighter to the air at dusk this Sunday in Portland for a nice, old-fashioned dogfight.  There was much mayhem:

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Maker Faire 2018

May
20
,
2018
| 0 Comments

Darlene and I made it out to Maker Faire again this year:

Click through for the full gallery:

    

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A Flying Camera

March
07
,
2017
| 0 Comments

2.9 minute video demonstration of the Mavic Pro (223 MB)

This is a short little video montage of my first few flights around my house with DJI’s Mavic Pro – a fantastic, compact little flying camera platform.  This thing folds down to about the size of a quart-size water bottle, weighs only 2 lbs with a battery and flies for about 25 minutes per charge.  It’s got a tiny gimbal-stabilized 4K camera that can capture up to 4096×2160 video.  (The video above is downgraded to 1280×720 but here’s a short snippet of 4K footage.)  The Mavic Pro has lots of sophisticated smarts on board too: automatic return to home, obstacle avoidance, vision positioning system, object tracking/following/circling, etc.  It maintains a live high definition feed to your phone/controller wth a range of over 4 miles, though FAA rules require that you maintain visual line-of-sight and stay below 400 ft from ground level at all times.  (Also, drones and other remote-controlled aircraft cannot be used in national parks, wilderness areas, ski resorts, around crowds or events, etc. without special permission.)

The Mavic Pro is very fun and easy to fly and it’s amazing how clear and stable the video footage is, even enough to use it as a flying tripod or do time-lapse photography.  Best of all it folds down so nicely to fit easily into a small backpack or carrying case.  It’ll be fun to bring this along on some hiking and biking trips.

Here’s some additional footage – the first from nearby Wilder Ranch State Park, including trying out the Mavic’s “Active Track” flight mode and the second from just north of Pescadero Beach while looking for whales:

Wilder Ranch (50 seconds, 59 MB)

Near Pescadero (85 seconds, 110 MB)

Here’s DJI’s related SkyPixel site where you can see sample drone photography.  Here’s one of many reviews about DJI’s Mavic Pro, if you’re interested in more detail.  I’d recommend buying DJI’s “Fly More Combo Pack” which includes the Mavic Pro but also two extra batteries, two extra propellers, the four-battery charging hub, a car charger cord, an adapter for charging your phone or other USB device from a battery pack and the DJI  carrying case/shoulder bag.  You’ll also likely want to get a lens shade as the Mavic’s camera tends to easily catch sunlight even when not pointed at the sun.  This one works well, while this one is too fragile and breaks easily just mounting it.

And one more bit of footage – sneaking up on Darlene’s family while they were here visiting:

Drone Attack! (60 seconds, 22 MB)

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Maker Faire 2016

May
23
,
2016
| 0 Comments

A bit of video from this year’s Bay Area Maker Faire:

Video montage of the 2016 Bay Area Maker Faire (5:35 minutes, 114 MB)

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Riding the Segway

June
10
,
2015
| 0 Comments

While visiting with Darlene’s family in Wisconsin/Minnesota, we went for a Segway ride and tour in La Crosse this past Sunday with Shel, Dan, Kathy and Shelly.  It was my first time trying one and it was a lot of fun.  The handling is very intuitive and responsive – to the point of being a little addictive!  If you have yet to try one, look for a tour or rental in your area (like La Crosse Segway Tours) – it’s definitely worth it!

Click through for the full gallery of pics and video:

  

A short, 75-second video montage from our Segway ride in La Crosse, WI.

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“Have you played Atari today?”

May
27
,
2015
| 0 Comments

A little while ago, after reading “Ready Player One” again (Spielberg is making a movie!) and after seeing a couple of tech talks by old Atari game programmers, I was lamenting that I sold my old Atari VCS so many years ago.  Well, Darlene jumped on this comment, found a bundle someone was selling on eBay and surprised me with an early birthday gift.  Yup, an old Atari VCS/2600 (four switch version), a set of controllers and a bundle of game cartridges. Sweet!  (I think my brother and I actually had the six-switch, Sears-rebranded version, but still very cool!) Thanks, Darlene!

I immediately had to go fill out the set of 40 cartridges with a couple of other games I remember us playing a lot.  Of course then was the challenge of hooking it up: the Atari outputs an analog RF TV signal… on an RCA-plug cable.  You can use an adapter like this one to go from RCA plug to coax TV cable input.  I don’t have a TV tuner, so rather than pulling a VCR out of a box in a closet, I hooked it up via my old USB EyeTV tuner/video converter to my MacBook – success!

IMG_4059 IMG_4052

Yeah, you can play any of these games via emulation on a modern computer, or even a smartphone/iPad, but there’s something very different about jamming the physical cartridge into the old physical console and handling that classic Atari joystick.  (And having to use cotton swabs and alcohol to clean the contacts on all of the Activision cartridges to get them to work again!)

It’s been fun to pick these up and rediscover old visual/procedural memories, like the admittedly-simple path through the Adventure maze.  Some titles are only vaguely familiar until you plug them in and see the game again and then go “aha!!”

So… to paraphrase Atari’s old marketing… have you played your Atari today?

to_be_continued

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Collapsible Convertible Kayak

October
30
,
2014
| 2 Comments

We got to try out my new gear earlier this week: a collapsible, convertible kayak from Advanced Elements.  It’s the AdvancedFrame Convertible model and it’s an inflatable 15 ft. kayak that converts from single to double and from open to closed deck.  Most importantly, it fits in your trunk!  No need to haul it on top of your vehicle (or in a trailer) to your destination!  It packs down into a bag 36″ by 21″ by 11″ and 56 lbs.  I’m particularly psyched about the idea of bringing it on road trips, like to the Sierras, and having it available as an option to pull out whenever or wherever we might choose.

This is an inflatable kayak with aluminum structural elements in the bow and stern and it’s very quick and easy to set up or take down. (Like 15 minutes or less.)  It’s designed with a tough outer skin around an inflatable frame consisting of two inner chambers and has a couple of rigid fins and a skegg to help it track a straight line well.  There are a number of optional extras to customize it, including single and double closed deck tops.

Darlene and I tried it out this Tuesday at the Elkhorn Slough, launching from Kirby Park.  We set it up in open deck form and tried out the optional, high pressure drop stitch floor which provides more rigidity than the standard floor.  There’s also an optional, aluminum “Back Bone” pole that can be placed under the standard floor that gives the kayak a more pronounced V shape underwater.  We’ll be trying that configuration later.

It performed great.  It felt very stable, moved quickly and tracked straight lines easily.  It felt very much like a normal sit inside sea kayak.  There’s plenty of room for the two of us plus some gear.  (And I’m 6’4″, 195 lbs.)

After Darlene finished her meeting (calling in while we were out on the water), we tried out the sail attachment.  This particular sail is from Advanced Elements as well and is designed to clip into the front buckles on the kayak and hold its form without intervention, leaving your hands free to paddle.  This worked well and the big transparent panels on the sail made it still easy to see where we were going:

DSC00793 P1010811

 

And, of course the big advantage is being able to quickly collapse the whole thing down and tuck it into a small space in your vehicle… with or without the help of passing pelicans:

I took it out again the next day, but this time I configured it for one person, placing the seat in the middle space and installing the optional covered deck.  (There’s also a covered deck for the two person configuration.)  The single person deck has a hatch behind the seat to provide access to storage area and both the single and double decks have inflatable rims that allow you to attach a spray skirt.

 

The kayak still handled very well with just one person.  Next time though I’ll be using the optional, adjustable foot rests.  This wasn’t necessary in the two person configuration, at least for me in the back, because of the inflatable thwart behind the front seat position.

So there it is, the AdvancedFrame Convertible, providing a compact one or two person kayak tucked into the trunk of your car!  If you’re looking for more reviews, take a look at paddling.net or Amazon.  Check out AirKayaks.com if you’re interested because they provide some nice bundle deals and make the extra effort to provide nice demonstration videos on many of the products they sell.

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It looks like Pan and Hera might want to join me on my next excursion in the kayak:

P1010843 P1010844

 

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Robot in the House

August
03
,
2014
| 0 Comments

For years I’ve dismissed those little semi-autonomous, robotic sucking machines.  It sounded like they weren’t really worth the trouble since they couldn’t really run for very long, pick up much debris in their tiny compartments, deal with furniture without missing spots or getting stuck or trapped. With all the need to supervise, it sounded easier and quicker to do it yourself.  But then recently I stumbled on a review of a new model and was intrigued by the improvements and the possibility of a little machine to help keep up on all that cat hair my two furry friends are always producing.

 A fun video showing my new little helper in action (1.5 minutes, 24 MB)

It’s the BotVac 80/85 from Neato.  Unlike its more well-known competitor (iRobot Roomba), this robotic vacuum cleaner does not just follow a random walk around the room, bumping haphazardly from one obstacle to the next.  The BotVac uses laser sensors to map out the shape of each room and build up a floor plan as it goes about its business.  When it encounters obstacles like tables and chairs, it will actually work to navigate around each leg, vacuuming under and around as much as it can.  It’s pretty amazing (and mesmerizing) to watch it navigate around the house, room after room, following its little internal rule sets to deal with various obstacles as they come up.

  • When the BotVac gets low on charge, it will actually backtrack through the map it built to return to its charging base and dock itself for recharging, even off in another room.  And when it has finished recharging it will return by itself to where it left off and continue the job!
  • It’s got touch sensors in front to help it maneuver tightly to objects and walls.
  • It has a sensor underneath to keep it from running off a cliff (or stairs).
  • It comes with some magnetic strips that you can lay down on the floor to cordon off rooms or areas that you don’t want it to intrude on.  (It’s much simpler than the battery-operated “fence” posts that the iRobot apparently uses.)
  • It has a little edge-cleaning brush on the right side.  (Thus it will always approach walls and make its rounds in a right-handed path.)
  • It’s squared off in front so that it can get into corners much better than fully round designs like the Roomba.
  • It has a larger-than-typical dust bin and it’s very easy to remove and empty out – without even having to turn over the unit.  It makes sense to also vacuum out the dust filter though.
  • You can set a schedule for when it should run but this doesn’t seem practical to me as I would first want to clear stuff off the floor and make sure there aren’t any cat messes that it would get into – and make worse.  (Hera often has stomach issues.)

It’s not quite a replacement for a full-size vacuum cleaner but it certainly does an amazing job considering that you can just start it up and let it go while you go about doing other things.  (You also do need a normal vacuum cleaner to clear out its filter.)  It’s pretty cool though to come back and find everything freshly vacuumed!  And it’s not really that loud (certainly much less than a full size vacuum) and it’s not too annoying to have it going about it’s business while you do other things.

One limitation with the BotVac is that at about four inches tall, it can’t fit under some furniture, particularly couches.  (The Roomba design has a lower profile and can fit under more furniture.)  Also, the BotVac can get itself stuck at times and need help.  This happens sometimes with furniture that offers just enough clearance for it to partially slip under but not quite enough for it to fit entirely under.  Often this goes fine and it will just work its way around, but other times it’ll get itself wedged in and need to be pulled out.  When it does get stuck or trapped, it will cut power to its vacuum and call for help by chiming.  It’ll then sit and wait quietly for a while before chiming now and again.

Here’s a much more mixed review of the BotVac that comes out in favor of the Roomba.  Some more reviews: BotVac 85 vs. Roomba 880 (favors the BotVac) and iRobot Roomba vs Neato Botvac (favors neither).

Note that the BotVac 85 is really just the same model as the 80 but it comes with two extra filters included.   (This wasn’t obvious to me.)  Both the 80 and 85 come with the two different brush types.

Now… what should I name him?

UPDATE (1/28/2015): The BotVac is still running but I have seen more of its deficiencies.  One thing that happens is that it essentially becomes a little senile with a low battery charge: it often has become unable to find its way back to its charge station with its battery runs low.  It will repeatedly and aimlessly search a small area (a couple of square feet) and after a long while finally give up and call for help – this without any obstacles in the way.  My guess is that it lets the voltage level drop too far on the battery now and is unable to sufficiently power its electronics and sensors.  At first it only happened occasionally, then it started happening almost every time.  But then, more recently (April 2015), it’s been working properly again! Weird. Anyway, when it does “go senile”, I have to pick it up and manually dock it at its charge station.  (If I let it continue its search for the dock right in front of it, it will just wander off again.)

The other issue (and this is more annoying) is that its methodical method of covering a room means that it will get into try over and over again (unsuccessfully) to reach some particularly difficult spot (due to furniture) and waste a lot of its battery charge or even eventually get itself wedged in or otherwise stuck.  Bringing it back out again will often lead to it just finding its way right back into that spot.  I’ve since got into the habit of leaving some strategically placed pillows or other items to prevent it from getting into those spots.  This is where I imagine the Roomba might do better with its random walk pattern: it probably won’t get stuck obsessively trying to reach the same spot.

Lastly, as I mentioned earlier, the biggest problem with the BotVac is the little laser assembly sticks up in the center of the unit. This protrusion isn’t accounted for when the unit tries to go under some furniture so it can end up wasting energy trying over and over to get under some furniture or even getting wedged under such furniture.

However, the BotVac does still do a good vacuuming job and it’s great to be able to set it off running while you take care of other things.

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Pivothead Sunglasses Camera

May
11
,
2014
| 0 Comments

I’ve been trying out a new pair of sunglasses with a built-in video/photo camera, the Pivothead Recon.  The Recon (actually now called the Kudu) is one of several styles of camera glasses from Pivothead.  The glasses can record video at 1080/30 or 720/60 fps as well as take still photos (up to 8 MB).  They can even capture stills while you’re recording video.  They have interchangeable shades, including the photo-chromatic kind (adjusts to brightness).

The camera functionality works pretty well except that they currently have some issues with their various focus modes.  The continuous focus mode hunts for focus a lot, the fixed focus mode is set to a focus point that’s too close so most of the time everything is very softly focused, but I’m getting the best results with the auto-focus mode which sets a focus when you start recording and holds that for the duration of the recording.

The exposure isn’t always ideal but then it’s pretty amazing that they can cram all this functionality in a sunglasses frame (rather than having a bulky camera mounted on your helmet).  Another issue though is that the little LED lights on the inside of the frame aren’t really visible while you’re wearing them so you have to pull them half off to verify that they’re on and/or recording.  Given that a) you can’t start recording until a couple of seconds after you hit the power button and b) they automatically shut off when idle after 30 seconds or so, it’s easy to think you’ve started recording, when you haven’t.  (This keeps happening to me.)  It would be better if the little rocker switch to start/stop a video or take a photo would actually power them up, rather than having a separate power toggle button.

IMG_0091

Trying out the Pivothead Recon Sunglasses/Camera

The glasses aren’t very adjustable for different faces.  Mine tend to sit high on my nose and the camera points up a little high but this ends up working out to a good angle for mountain biking.  Yes, that picture was taken using the glasses, but I titled my head down (and still heavily cropped it to frame it well).  Without doing that, the center of the shot would actually be well above my head.  But as I say, that has to do with individual fit and it works out fine for me while on a bike.

The Pivothead charges via USB and you can get a combination external battery pack and WiFi hub (Pivothead Air Sync) that allows you to charge it up and download your shots when you’re out in the field.  It’s also useful as extra power for any USB-chargeable device.

Here’s some sample video showing some of its strengths and weaknesses.  (Also, this video was shot with these glasses as well.)  Both videos have of course been downsized and compressed for web presentation:

 

Note the challenges in dark, high contrast lighting in the trees and how quickly (or slowly) it can adjust to changing lighting.  Obviously it does much better in brightly lit scenes.  Also, it would be awesome to have some optical stabilization but that would be asking a lot at this point, particularly in the frame of a pair of sunglasses.  Really I just hope they can fix the other focus modes and improve the start/stop method.

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“Oh my god, it’s full of stars!”

January
03
,
2014
| 0 Comments

I’ve looked into telescopes a bit now and again, spurred by some new cool astronomical event but never actually took the plunge until just recently, near the end of 2013, with the approach and subsequent demise of comet ISON.  This time I was committed to doing the research and actually ordering some gear… and, given my love of photography, astrophotographic gear too!  Oh my, what a deep hole I’ve found here… what have I got myself into?!?

Things started out a little rough as my mount arrived in November with a manufacturing defect that I didn’t know enough to figure out immediately and required some back and forth with Celestron’s tech support to narrow down.  Then I had to package it all back up and send it back and wait for a replacement.

But here it is, it’s an 8″ Celestron EdgeHD 800 on an Advanced VX mount – lovely!  (It’s a Schimdt-Cassegrain on a German equatorial mount.)

My Celestron EdgeHD 800 telescope set up on my upstairs deck

I’ve long wanted to get a telescope, as in a real telescope, not that silly cheap thing I got as a kid in the 70’s.  I’ve tinkered on and off with desktop and mobile apps for exploring the night sky, explored a bit with a nice pair of image-stabilized binoculars and attended the occasional star party here and there.  (The one held on the slopes of Mauna Kea was pretty cool!)

And I wanted to take advantage of the somewhat darker skies I now have here in the hills above Santa Cruz – at least darker compared to my old condo in San Jose – that swath of light from Silicon Valley and the Bay Area is at least somewhat shielded by the coastal mountains here.  I’ve got a nice, super-convenient, south-facing deck off of my upstairs master bedroom with an open view of most of the sky (except to the north, beneath the celestial pole).  And once I get a little more experienced, it’ll be fun to pack up the gear and take it to some remote dark locations.

DSC01262-v3 DSC01298

It’s pretty overwhelming how much there is to learn, particularly when you get into astronomical imaging, but I am certainly enjoying the endeavor.  As such, I’ve decided to put together a little newbie’s guide to backyard astronomy to summarize all the information I’ve been gathering and the choices I’ve been making as to gear and setup:  A Newbie’s Guide to Telescopic Adventures

So here’s a bit of first light through it – imaging a portion of the Orion nebula.  Mind you, I’m just starting to get into this and this is just a newbie’s single, 16-second exposure to catch a bit of color:

Orion Nebula (M42), Nikon D7000, 16 seconds @ ISO 6400, 8″ EdgeHD, .7x reducer lens

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A Newbie’s Guide to Telescopic Adventures

January
03
,
2014
| 17 Comments

(First published January 2014)  

Thank goodness for the wealth of easy information sharing on the web.  Would’ve been quite different diving in back in the early 90’s.  Of course the gear has advanced a lot too.  So here I am sharing the experience of jumping in relatively new.  And how foolish for a newbie to write a guide for other newbies?  Well, you’ve been warned – though I’ve long had an interest in astronomy, I’m really only just now getting into this very deep!

Continue reading »

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Santa Cruz Blur TRc demo ride

August
29
,
2012
| 0 Comments

I’ve been happily riding my old Santa Cruz Superlight since I got it way back in 2001.  I’ve never been too interested in keeping up with all the yearly new bike tech and I get pretty bored with all the bike talk at many ride meetups.  (nerp derp berp)  I just like to ride on da trails!  So I had yet to try tubeless or Propedal or dropper seats or any new geometries and shocks.  I didn’t even get around to disc brakes until like 2010 – and I had to get new hubs and wheels to do it.  However, somehow the most recent batch of talk about new bikes among friends and other riders finally got me to go try a demo of something a little more… modern.

With a little bit of research, the Santa Cruz Blur TR Carbon caught my interest and I even managed to find an XL available for demo — not the easiest size to find anywhere!  This is their recent “Trail” version of the Blur introduced last year as something between the Blur XC and Blur LT.  Here’s a great video explanation of why Santa Cruz made this bike.  So I took it out on some very familiar trails in Wilder Ranch yesterday….

Continue reading »

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Ordered a New Car!

December
29
,
2005
| 0 Comments

I’ve ordered a new car! It’s the very fun-to-drive, five door Audi A3 with the 3.2L V6 and all wheel drive (Quattro). Unfortunately, all the 3.2’s in the western United States have the “open sky” roof option and I’m too tall for that. So, I had to order one and wait for production, overseas shipment, delivery, etc.

Most of these pictures are of the 2.0L front wheel drive version – fun, but it didn’t make me smile like the amazing low end torque on the 3.2 version which also has the sport suspension of the S-line package…. sweet! And this little guy has enough room that I can sit behind the driver’s seat adjusted for me! (Heh, why would I give up the driver seat though!?) It’s actually faster and handles better than my Supra, has better mileage, has all wheel drive and is tons more practical with a real back seat and I can even sit up straight in the driver’s seat without hitting the roof!

Now… which color??

  

Update (4/29/2006): And here it is, on arrival four months later:

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