Servo Jumpy with DT Interrupt

[Mike, K8LH]

That is interesting Mike. I had not seen that before. (ccp1x, ccp1y, and the register for ccpr1l are different on the 16f690, so some tinkering required).

Yes, you would need to change bit labels to match the device you're using. Sorry!

You could also use Darrel's 18F servo code: http://www.picbasic.co.uk/forum/cont...e-Servo-Driver

I didn't care for that method (it's not entirely interrupt tolerant) but it probably would work fine for the OP. The odd interrupt interval timing (26.2144-msecs) would make it difficult to use for for general purpose interval timers.

If you are not tied to hardware, you could do it (almost) exclusively in hardware with a 18f2431 or a 18f4431 chip. These allow PWM down to 19 hertz on their power control pwm port pins. They have a "single shot mode" which gives the servo a single shot pulse. An interrupt would run at 20 ms to tell the single shot pulse widths when to fire. See the bottom of this wiki for more info: http://www.picbasic.co.uk/forum/cont...-encode-decode

That's an excellent example. Thank you.

If anyone is interested, here's the link to another example of the PWM "frame" method for 8 or 16 "zero jitter" Servos with 250-nsec pulse width resolution (4000 steps between 1.0-2.0 msecs); 8 or 16 Servos using the PWM module

Happy Holidays everyone!

Cheerful regards, Mike