Detecting servo signal

[iscarelli]

Hi!

I need to detect a servo signal from a RC Rx and repeat to the servo.

If the PIC detects a fail in the signal it will put the servo in a pre recorded position.

I am thinking to use a 12F683.

[]'s
Ismael

[SherpaDoug]

This sounds like a trivial problem.
1) Set a timer longer than the max servo signal period.
2) Look for a servo signal starting edge.
3) Check just before the minimum valid pulse time to see if the pulse is still there.
4) Check just after the maximum valid pulse time to see if the pulse has ended.
5) If everything is fine, zero a Bad Data counter and restsart the timer.
6) If the timer times out or either of the checks is bad, increment the Bad Data counter.
7) When the Bad Data counter gets too big, substitute the fixed position data.

Implementation is left as an exercise for the student.
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[iscarelli]

Hi!

Thanks for the reply!

Can you give some examples or material to study about timer implementation in CCS?

[]'s
Ismael