Minor correction: PPM for RC is pulse "position" (as opposed to width in
PWM) modulation.

2007/5/6, John Ferrell <johnferrell@earthlink.net>:
>
> The radio output of an RC receiver is a pulse. The width of that pulse
> determines the servo position. The accuracy and repeatability as well as
> the
> output power are reflected in the price of the servo. You can either work
> from that pulse OR use a high quality servo of your choice to turn a knob.
> Most of that kind of setups balance a bridge.
> The chips in the servos have all been unobtainable by me!
> Good luck...
>
> John Ferrell    W8CCW
> "Life is easier if you learn to plow
>       around the stumps"
> http://DixieNC.US
>
> ----- Original Message -----
> From: "Bob J." <rocketbob@gmail.com>
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Sent: Friday, May 04, 2007 9:17 PM
> Subject: [PIC] r/c receiver interfacing
>
>
> >I am looking to build what is essentially an a huge radio-controlled
> servo
> > with a stepper motor.  In order to drive the stepper motor, I have to
> > convert the r/c receiver's pulses into step/direction pulses.  To my
> great
> > surprise I googled for something off-the-shelf to do this, but have come
> > up
> > empty-handed.  Has anyone done this sort of thing?
> >
> > Regards,
> > Bob
> > --
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>
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-- 
Ariel Rocholl
Madrid, Spain
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