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Author Archives: Jim
Cheap USB LiPo charger notes
I got a couple of cheap ($1.29) 1A USB LiPo chargers since I’m doing more and more LiPo/LiIon powered stuff. I mostly discharged a recycled 18650 cell for a test load and it looks like it does charge at nearly … Continue reading
Adding an image to a board in Eagle
I wanted to include a Workshop 88 logo on a board Rudy had laid out for the MAPR badges, but didn’t remember all the details from when I’d done it for the Great Global Hackerspace Challenge Educubes. This note is … Continue reading
Posted in Miscellaneous, PCB Etching
Tagged bmp, board, Eagle, image, insert logo, ulp
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Shapeoko 2 cutting tests
Now that the W88 Shapeoko 2 (graciously donated by Inventables) is mostly working, we tried some test cuts in various materials. All were done with my old Dremel and a 1/8″ upcut end mill (WRONG: downcut; see update at end). … Continue reading
Posted in Workshop 88 Stuff
Tagged grbl, Shapeoko, Universal Gcode Sender, Workshop 88
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Current sink and starter’s gun boost converter test
Background failures I’ve had some problems getting DC power for the audio amp for the starter’s gun project. I needed maybe 15V to get the output I needed, but didn’t want a battery voltage that high, so looked at boost … Continue reading
Posted in Miscellaneous, Rf starter's gun
Tagged current sink, heat sink, IRFZ34N, XL6009
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Tiny85 dev/target boards
Just a quickie, but it seems to delight me. I finally got around to making up a little bunch of generic Tiny85 boards so I can knock out some simple projects. They’re a lot like the I2C slave boards for … Continue reading
Quickie 1-cell discharger
Wow – I wasn’t planning to make this. But as I fantasized about just building a simple discharger while struggling with 1-cell problem on the big 18 cell discharge tester, it sounded too simple to resist. I could get to … Continue reading
Posted in Little Discharger, Tiny 85 stuff
Tagged Arduino, battery discharge, mini shield, MOSFET, perfboard
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Battery discharger problem with 1 cell
The big battery discharger works well (or so I thought) except for the case of testing single 1.xV cells. It just doesn’t work – reporting 0V often. There’s even a comment in the code dated 2/15/11 (right under the V1.3 … Continue reading
Working with recycled HDPE
This is just draft stuff – sort of so I might remember things I did. Needs actual rewrite, pictures, more meat. But at least I have a place to capture some efforts. It really seems like scrap HDPE – like … Continue reading
Protected: RF Starter’s gun project status
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Posted in Rf starter's gun
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Car has music again!
It’s always nice when a little DIY work can save you $30,000. The 6 CD changer in the Prius wouldn’t play the other day. I noticed a CD partially ejected and when I couldn’t get the unit to eject it, … Continue reading
Posted in Miscellaneous
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