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September 21, 2011
about 6 years ago
I used AVRstuduio 4.18 and my programmed is a JTAGICE MKII Chinese clone from MCUzone (I got from ebay). Any in-circuit programmer for atmels should do fine. I did not solder the 6-pin header in the board as it takes too much space and the fob wont click closed. I just held it in place with a bit of a gentle twist on it to ensure contact. Programming only takes a second so its not too fiddly.
Code files (for AVR studio) are at:
See the readme.txt for what to change.
Its almost the same as the original version from sparkfun, just minor changes (and room for more improvement…)
Hope it helps..
Got my keyfob today and after some minor tweaking works well.
I modified the keyfob firmware to give a button number (1..5) instead of a bit pattern and set the transmission to 2-byte CRC instead of 1-byte so the transmitted packet is more robust.
My receiver is the sparkfun module..
http://www.sparkfun.com/products/705 using some arduino code for receiving.
Initial range is about 40ft but the setup was not optimal so some more testing required.
Here is an Arduino sketch I modified to allow reception of an off-the-shelf unmodified keyfob. Makes it easier to just get something working.
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