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Archive for September, 2014

SD Card errors with Arduino / Teensy 3.0

With my LED cyr wheel I kept getting random errors in reading data from my SD card with Ardunio code. Sometimes init would fail, even at half speed. Most often I would get corrupted data, or not be able to read the filenames. Worse, it would start to read and then fail. Searching around, I found it could be one of the following problems: * Bad SD card (I tried a few of them) * Improperly formatted SD Card (I used the official SD Card Formatter from SD: https://www.sdcard.org/downloads/formatter_4/ and it still failed) * Floating CS (Chip Select / Slave... [read more]


Firewood Hutch

An oak tree fell down at the end of last winter and I ended up with a lot of great firewood. I saved a few pieces for woodworking (we’ll see how those turn out), but the rest is going to heat my house. I needed a convenient place to store the firewood, and I originally was going to turn my back door cement area into a covered firewood area‚Ķbut Costanza and my friend Mark convinced me it was a bad idea (it would block too much light into my house). So, I designed a little firewood hutch that would go... [read more]


LED Cyr Wheel on Stage

Some pictures of my work with Velocity Circus at an event for UCSF Photos by Hiromi Yoshida, Courtesy of Gregangelo & Velocity Arts & Entertainment


Photography: LED Cyr Wheel v2 Self Portraits

Self Portraits, Corbin Dunn, LED Cyr Wheel v2, September 11, 2014. Canon 5d, a timer of 10 exposures manually set for a specific aperture and shutter speed. Man Silhouette Pattern Test Single Pattern Test


Final drive ratio in an electric conversion car

So, I’m getting a new transmission for my VW bug (number 3), and probably buying it from http://www.mofoco.com/category/Rebuilt_VW_Transmissions/c112. What drive ratio should I get? They can do a few different options. My bug is/was currently running the stock stuff for a 69 bug: I have 165R15 coker tires, and the diameter was calculated via: http://www.evsource.com/motor_calculator.php & http://store.cokertire.com/tire-styles/radial-tires/wide-whitewall/165r15-bfg-2-1-4-whitewall.html The ratios I got from the VW manual, and the screen shot is from my Numbers spreadsheet (email me and I’ll send it to you). Here are my current speeds for a given RPM and a given gear. Max motor RPM is around... [read more]


Electric VW: Transmission Killer

In my last post on the bug, I had mentioned that I replaced my brushes, hoping it would fix some noise I was getting in the transmission/motor area. It didn’t help, and I then replaced two CV joints, as one was worn pretty bad. That also didn’t help. So, I bit the bullet and removed the transmission/motor. This isn’t fun; I have to remove some of my cells in the rear seat area as they cover the hatch that lets me undo the transmission from the shifter. It isn’t too bad; I simply undo the red hold down strap, disconnect... [read more]


Kitty Cabinet: Finished

I finally finished my Kitty Cabinet. I had to wait for some more Water Based Poly finish to come; I had accidentally ordered “gloss” when I really wanted “satin”, so it had to be put on hold until I got back from a vacation in Italy. I use water based finishes from Target Coatings. It looks rough in the picture, but it turned out quite nice. I put one coat of a shellac amber sealer on, followed by 4 coats of satin poly (water based). Without the doors: Doors: Kitty entrance:


Photography: Rome Street

Rome Street Camogli, Italy. August 2014. HDR from 5 exposures. Canon 5D Mark III, 24-70mm lens. No tripod; supported by a plant for a bit.



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