Labor day kit/amp build.

I built a small battery-powered amplifier today.


Not too long ago, I bought a small, inexpensive amplifier kit from tindie.

JTAG Nostalgia

JTAG adapter

Long story short: the GuruPlug JTAG wouldn't even debug the GuruPlug, let alone any other board I tried it with. I knew my freshly-compiled bleeding-edge OpenOCD was at least somewhat functional, because it was able to talk to my TI Evalbot through an onboard FTDI2232 USB-JTAG/UART chip. But it wouldn't talk to the FTDI2232 in the GuruPlug JTAG dongle.

toorcamp 2012

Talk to jmej, or friend jesse.mejia on flickr to add your images to the slideshow!.

PDX Mini Maker Faire - September 15 & 16

what! what!

I'd like to be help out at the pdx dorkbot booth... who's putting this together?

Applications are due no later than 11:59pm on August 5, 2012.

4th Sunday eTextile Workshop

When: July 22, 2012; 4-6pm

What: Introduction to soft circuits

  • Make & Take: LED patch
  • Tech Behind the Beauty presentation

Who: All levels of know-how! Newbies especially encouraged.

Where: Lovecraft Bar, 421 SE Grand Avenue Portland, OR 97214 (Look for the red door on the West side of the street) Due to the location of this event, you must be at least 21 to attend


  • $25 for new participants
  • $10 for those who attended workshop #1

Cash and credit card payments will be accepted before the workshop begins.

All materials supplies are included.

ARM LCD Dev Board Eagle files

Recently I posted about the ARM based LCD development board I showed at a Monday DorkbotPDX meeting. At that time, I was waiting for another revision of the board before releasing the Eagle files. I got the next version back and it looks OK so I've attached the files.
The firmware source code is available on GitHub.

Honey Bee Counter

New project close enough finished to share... thanks to Paul (teensy) and Lean for the help getting this on its way to being done! cheers,

Two Years of Pretty Good Service

I engaged Pingdom to monitor my home sensor network several years ago when I started to depend on it and found it undependable. The recent upgrades at Pingdom had me looking through downtime stats wherein I found my service to myself to be pretty good:


The persistent downtimes of 2010 were replaced by occasional outages when I converted from Arduino with an Ethernet Shield to Teensy running Txtzyme from an old laptop. Recent failures are all attributed to power failures outlasting my aging laptop battery or Comcast changing my IP address. I'm especially pleased that my foam core and spring clip infrastructure has been serving me well.

Make Windows 8 Maker Friendly - Responses & Opinions

At Maker Faire, I met Philip Torrone briefly. We talked about driver installation issues, and he resolved to find someone at Microsoft if I would send a summary.

Phil ended up posting on the Make Blog. There've been many reactions, mostly online comments, some in private email.

I'll briefly summarize the responses and offer my opinions here. Just click "read more"...

DorkbotPDX 0x09


Dorkbot PDX would like to welcome you to the latest installment of our semi-regular presentation series:

DorkbotPDX 0x09


  • When: Monday, June 18th, 2012 - 8pm
  • Where: Backspace (map)
  • Who: All ages -- open to the public
  • Cost: Free!

What's happening? Two great and inspiring talks!


Christi Denton

The LAMOSO (LAsar/MOtion/SOund) is a MIDI controller; that is, it's a device that sends MIDI to my computer. MIDI is a standard music protocol that allows electronic musical instruments (e.g., the LAMOSO) and computers to communicate with each other. It's not audio - it's digital data that includes values for pitch, length, volume, etc.

So... the LAMOSO uses lasers and photogates to send signals to a computer, which then turns that data into sound.

The lasers hit (or don't hit) photogates. The photogates connect to a Teensy++, a "microcontroller development system" (it's the computer chip thingy in the pictures), and that sends my computer data about whether there is or is not a laser beam light hitting the photogate. Max, a music programming language, is used to interpret that data into music.

Visually and musically, what this means is that there's lasers crisscrossing an area, and when those lasers are broken, it changes the music.

Digital Painting

Jeremy Rotsztain

Jeremy Rotsztain writes software to generate digital images that closely resemble
paintings. Instead of working with paints and pigments, he prefers to use digital materials. He collects popular images from the Internet and iconic scenes from Hollywood films -- and uses their pixels and sounds to generate entirely new

Jeremy will be presenting and discussing two recent works:

1) "Obsessions" (prints made from photos of adorable pets)

2) "Action Painting" (abstract expressionist animations made from high octane car chases, violent punches, fiery gun shots, and sublime explosions).



An open-mic session for those looking to show off a project, ask a question, solicit help, or incite collaboration.

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