DorkbotPDX Open Mic Surgery Event Videos
Video from the Open Mic Surgery Event.These videos never made it to the site, I'm fixing that now! Thanks to everyone that came out! (Mouse over blank area below to trigger video loads.)
View ArticleDorkbotPDX 0x0A Presentation Videos
Thanks to everyone that presented (especially the new folks during OpenDork) and to thanks to everyone that came out! Glenn Phillips, Self Balancing Robots (http://glennselectric.blogspot.com/):Church...
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Teensyduino Regression Testomatic, 1st Try...
Over the last couple weeks I've been working on a automated test system for Teensyduino, which someday will verify nearly all the Arduino functionality on every board and also test most of the Arduino...
View ArticleUnix Select-Paste in Arduino Editor
The Arduino IDE editor's lack of support for X11's select-paste mechanism has always annoyed me. Well, I finally got around to adding it. Especially for helping people with their Arduino troubles...
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Maker Faire 2013
The Dorkbot booth at Maker Faire worked out really well. Here's a couple good photos Zach took:This is the right-hand side, with my extremely bright OctoWS2811 Arduino library demo triggered by stomp...
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Radio Spectrum Analyzer at Maker Faire
[This post is originally from my blog. I'm bringing this spectrum analyzer to Darren Kitchen's Hak5 event at OMSI this Saturday (2013/05/25).]Here's some details of my radio spectrum analyzer hack at...
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The HypnoLamp Goes to Maker Faire
Portland Dorkbot had a booth at the Bay Area Maker Faire this year. Here's my first proper invention, the HypnoLamp, alongside the Editor's Choice award that we received:Many factors helped birth the...
View ArticleAnswer to David Turnbull's c-puzzle from April 6th
David's puzzle on April 6th was a lot of fun to work with. If you want to see my answer, read the first few pages of:http://joseph-baker.com/DorkBotCPuzzleOverview.pdfMy answer to David’s puzzle...
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AD75019 Crosspoint Analog Switch
On my post about the regression test set, jeppius asked if I had sample Arduino code for these AD75019 chips.Click "Read more" for the Arduino code and details....First, a bit of background. The...
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USB Virtual Serial Benchmarks
Recently I've put a lot of work into improving USB virtual serial receive speed. Here's a detailed article with complete source code for the benchmarks.
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DMX Lighting Sequence Player
Portland CORE effigy at Burning Man will be using DMX controlled lighting this year. At least that's the plan, but a low-cost and low-power way to automatically play the lighting sequence (without a...
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Ideal diode circuit fixing
At the bi-weekly meeting tonight, as promised, I brought my non-working circuit, and as promised, Paul helped me get it working. It is a circuit that allows current to flow through a p-channel mosfet...
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Measuring microamps & milliamps at 3 MHz bandwidth
Recently I needed to actually "see" a current waveform in the 100 uA to 5 mA range with at least a couple MHz bandwidth. This extremely expensive probe would have been perfect, but instead I built...
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Newbe - needs assistance in ordering
I am looking for assistance (I will pay for your help) to design a Power distribution board for QuadCopters. This is a two sided board with heavy copper due to the large load of up to 6 motors.The...
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Audio clip player
Yesterday I made a little audio clip player for a Monty Python Flying Circus theme party. It plays the 3 second dramatic sound for the unexpected Spanish Inquisition entrance.Click "Read more" for the...
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Serge, Subotnick, and Pure Data - programming sound for dance.
This weekend I'm performing sound for a dance piece Light Noise that I've been working on for over a year. For the past year+ I've been refining a set of patches in Pure Data (PD) that I use to create...
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Quality Audio on Teensy3 with Arduino
Over the last couple weeks I've been working on supporting quality audio (44.1 kHz, 16 bit) on Teensy3 using very simple Arduino style programming. This weekend I added buttons and knobs to control...
View ArticlePrime Numbers the Hard Way
There's an artsy dude who got his Kickstarter mentioned on boingboing. The project is a little mechanical counter with some smarts built in: every time you press a button, it computes and displays the...
View ArticleEncoder Library Testing
In a recent forum conversation, it was suggested my Encoder library has only been tested with rotary knobs and "lab" signals, not a high-res encoder turned by a motor, implying it might not work "in...
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Battery Pack Load
I purchased a cheap USB power pack, thinking it would be ideal for powering small projects. But it automatically shuts off if the device isn't drawing a lot of power, since it's meant for charging...
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