First post, hopefully this is in the correct section... Admin feel free to move it - there's a few that this question could come under, I think. I did a search but "RC receiver" returns 34 pages of results, and more for "low voltage" =O if this has been asked just link me. =)
Anyway, Im looking to try to use my RPi as (ultimately) a wireless communication device for telemetry (GPS, etc) and controlling a quadcopter remotely or by use of pre-programmed waypoints (instead of a transmitter and receiver combo).
I would need 4 outputs that provide signal voltages to the quadcopter control board that range from 0.15 to 0.25V, 3 centred about 0.20V (+/-0.05) and one centred about 0.15V(+0.1) to mimic a RC receiver's output.
Firstly, I believe the latter will be easier to do =/ (for example) by using high-frequency switching with C to fluctuate the 3.3V GPIO from ~2.2 up to 3.3V, then passing though a step-down converter to get ~0.15-0.25V. Any ideas if this will cause any heat problems with the Pi?
Secondly - the hard part - does anyone have any ideas (Ive had a few) how to simply hold a steady 0.2V output with the GPIO (or other) and have it fluctuate between the aforementioned voltages without using an external regulator circuit or a massive resistor? haha!
Thanks a bunch guys! =)