PBP projects for R/C models

[Kenjones1935]

Originally Posted by Kenjones1935 View Post
The Electronic Speed Control wants this PWM signal to arrive at 50 hz.

I was not clear in my last posting. The Electronic Speed Control PWM specification is for a single positive pulse no less than 1ms and no more than 2ms once per 20 ms, ie 50 pulses per second. The one to two millisecond pulse width is divided into 256 parts. 1.5 ms corresponds to 128 which corresponds to neutral in a servo.

Neutral is steering straight on a steering servo. Neutral is stopped on a wheel driving servo.

I discovered that using HPWM with the 4mhz default oscillator a pulse width of 100 to 110 gets the behavior of 'neutral' on my car. For example "HPWM 1, 100, 50" turns the front wheels of my car to straight. See the attached picture. Channel 2 is the HPWM version of neutral. Channel 3 is what the radio receiver sends.

Ken