Project goals: * add automatic timer start and pause to the DX6i remote * minimal parts count: preferably only the PIC10F222 and nothing else * support both zero throttle at bottom and zero throttle at middle (collective pitch) * provide an audio warning when the remote is being left unused and turned on * provide active backlight control

Update 5th Sep 2012: source code published, looking for professional review

Nice to have features that would probably require a different chip: * proportional timer control depending on throttle position. This would beep annoyingly if done with the current setup * fix lame Spektrum bug with "throttle hold" not working for airplane setup. It is a bug since DX8 does it correctly * calibrate throttle range once and save it in EEPROM

Update 6th May 2012: second firmware version is available, meeting all the required goals. Development is stopped unless bugs are found.

Video with the first version: https://vimeo.com/39839925

Video with the second version: https://vimeo.com/41668214

Inactivity timer sound: https://vimeo.com/41668215

Check the wiki for descriptions. Binary downloads are available as well as hardware instructions.