Circuit and code to convert button presses on a generic wired Renault remote to commands for an aftermarket JVC car stereo, using an ATtiny85 or an ATmega88.

ATmega version supports: VOLUME_UP VOLUME_DOWN MUTE NEXT PREV EQUALIZER SOURCE

ATtiny version supports: VOLUME_UP VOLUME_DOWN MUTE NEXT PREV

Prerequisites

apt-get install avr-libc gcc-avr avrdude

ATmega

# compile for ATmega
make
# flash to ATmega
make flash

ATtiny

# compile for ATtiny
make tiny
# flash to ATtiny
make flashtiny

clean workspace

$ make clean