Hey. Ive worked some with servos on a project, and am familiar with the pwm signal used. Ive so far only hooked the arduino and receivr to the same power supply....so they were both on common 5V (nano 5v).
However i now want to move on to using it in an rc sensing application. The RC planes have their own power supplies, ranging from 4.8-8v.
Now the question: if i am running a HV receiver systems (Futaba HV using direct 2s LiPo), will the signal also be 7.4V? Or does the internal electronics bring it to a normal logic voltage of 3.3V or 5V?
I dont have an osci to measure it, and dont want to grill my nano by just trying.....
Unfortunately the servo signal is PWM between 5% and 10% high. That makes it impossible to get a useful reading of the peak voltage with a typical slow reading DMM/voltmeter.
And I've never used a Futaba HV Rx so I don't know the answer. All the servos I've seen use a 5V signal so that's what I'd expect from the RX but I'm only guessing.
PWM is generated and sensed by microcontrollers these days, 5V will be expected I think. To be safe add 1k
resistor in series with the signal, then >5V isn't going to hurt you.