Today I shipped off my LED Matrix design for fabrication!
The LED Matrix is a 4 by 5 matrix of LEDs that will blink out messages or the time or something. Â I was inspired by the Wayne & Layne design and decided to give a try myself.
More after the cut.
The circuit is a very simple charlieplexed design that will work well with the ATTiny25 microcontroller I chose for this project. Â The only other components in the circuit are an ISP header, a reset push-button, and a CR2032 battery holder for power after programming is complete.
This will be my first surface mount project. Â I chose 1203 sized components because they are large. For solder paste I bought whatever was available from Digikey in a relatively small package. Â There was a choice between leaded and non-leaded: I went with the leaded. Â Matt suggests trying the hot-plate method but says an iron and some solder wick will probably also work. Â Digikey also had tweezers so I got a cheap pair of those also.
As this was my first circuit board, this was also my first interaction with Gerber files. Being too lazy to find a Gerber viewing package for mac, I used the CircuitPeople Gerber viewing package. It worked well enough for my purposes but I had trouble printing to scale using the PNG files it outputs.
I am using the DorkbotPDX fabrication service for my design. Â The price is relatively cheap at $5 per square inch. Â Laen also provides detailed submission instructions and so far the process has been relatively painless. Â The actual run goes out on the 21st, but the panels have been filling up early, so I put in my project early to assure myself a spot.
That’s all for now. Â I’ll update more next month once the boards have come back from the fab.