Fingers crossed it'll cut ally

[irving2008]

Hi Irving,

1. This explains far better than I could:
http://www.servocity.com/html/how_do_servos_work_.html

2. Servo tester is £5 - £15
http://www.fast-lad.co.uk/store/prod...oducts_id=1716
The potentiometer on the tester controls the width of the pulses, and replaces the signal it would otherwise get from the reciever. This signal moves the output arm of the servo motor to the required position, or for the throttle, the engine to the required speed. It is fully proportional.

I wondered, with my limited electronics knowledge, whether the pot could be removed (which must just provide the pulse generating part of the servo tester with a 0 - 4.8v output) and via a magic box the Mach3 0-10v could be connected instead.
I'm sure you could come up with something along these lines or better !

Does this help you with a better plan?

Ah, you've already replied. Looks like you have it in hand!

Thanks... I know how RC systems work, just wasnt sure on the PWM characteristics, its 30+ years since I built and flew anything (but my 10y old nephew is showing an interest so maybe I'll resurrect that... along with the 47000 other projects)

MACH3 doesnt produce a voltage just its own fast PWM train, which has to be converted to a voltage. My solution does that, tho it would be possible to use the PWM/ECCP (count and compare) function in the PIC to measure it directly, but that needs a PIC with two PWM channels and the 14pin ones only have one. Needs more software to be written too!