Tonight I assembled the adafruit usbtiny programmer. It will be the programmer I use with my LED Matrix project when those boards come back. The instructions from adafruit are great and I would recommend it as it seems to be very flexible in operating voltages and protocols.
One point I’m confused is the use of jumpers or 1.5KÎ© resistors for R4 and R7. Â I went with jumpers I made from some hookup wire I have laying around. Â Hopefully that’s correct.
According to the adafruit instructions, the usbtiny won’t light up until you’ve pinged it with some avrdude instructions. Â This is distressing because you expect the red power LED to light up when power is appliced, but USB must enumerate it for power to be provided. Â I got avrdude version 5.10 installed using macports and applied the command:
/opt/local/bin/avrdude -c usbtiny -p m8
After that the LED’s lit up and I knew my work for tonight is complete!