I’m still getting the initial build documented, but you can now see a bunch of pictures I’ve taken of my first Propaganda-made PC board in action. It’s a 4x4 RGB LED shield that sits on top of an Arduino (or Seeeduino!). The LEDs are controlled by a trio of TI TLC5940 LED driver chips with each one controlling one of the color channels. This allows for some very bright applications; the TLC chip supports 4096 different PWM levels per output channel, and they’re driving all 16 LEDs at once with no multiplexing.
The project is documented at combee.net/rgbshield. I’m going to put up assembly instructions and a full parts list soon.
You can see the picture set online at unwiredben.livejournal.com/290964.html. I’ve got a few tweaks to make for a 1.2 version – I’d like to use a dual-row of headers on the signal pins to allow using default signal routing with a set of jumpers, and I want to add the circuit to the BLANK line to keep the LEDs turned off during reset and board programming.