I was using the programming half of a a bulky prototype that I have been working on to program one of the mice from “Thing-a-day” Day 1 and I looked at the pile hanging precariously off of the coffee table and thought to myself.
“I need to just build one of these. “
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So I did.
The programmer is based on the Auto-Reset Hack and the AdaBoot bootloader. The reset is pulled by putting a capacitor on the DTR line of the serial interface which is also the bootloader interface. Most people put the cap on the Arduino but I put it on the programmer (where it belongs). This programmer was built using the ftdi ft232rl breakout board sold by sparkfun. I had to trim it down to get it to fit in the pretty blue box i bought at Tap Plastics. The chip out of the box presents two of its 4 gpio (general pourpose i/o) pins to indicate when serial is being sent and recieved. I wired a pair of very bright leds that I had to them and then tried to pipe the light to the corners using some translucent plastic tubes and hot glue. It looks pretty cool!
feurig
Drupal mangled this worse than wordpress.
feurig
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feurig
This is the basic ftdi circuit for communicating with and programming Atmel devices with built in serial bootloaders.
I am a proponent of putting the cap on the interface as above.
Nothing says you cant put a cap on each target board and a jumper here.
Working on ramble about how to……