hoe to find servo Pulse Width Modulation

[spankedchrome]

Do you readers know the best way to detect the PWM on a servo circuit PCB ?.
I'm requiring forward pulse and reverse (a wire each?) to attach to my new H-bridge for servo proportial feedback with a larger scale motor+gears.
I would otherwise use a setup of relays ,but there slow and noisy and a sparky fire hazard !!. :)








:)

[Zlatko]

spankedchrome,

I haven't seen any open source info on this and would be interested too.

Jean Louis Coural of www.microplanesolution.com makes some ultralight servos.
Go to http://www.microplanesolution.com/mps_000010.htm ( top photo ) .
Email him, he may be willing to sell you just the programmed pic ? and help you with wiring ( perhaps even a complete servo driver? ). JLC has been helpful and patient in the past with my .... "strange requests" ;)

I am interested in seeing your finished project, it sounds like a monster if you are planing on using windscreen wiper as the servo motor. :))

Good Luck

[Mr.RC-CAM]

If you want to hack the servo's IC controller to connect your custom H-Bridge, then start by identifying the IC that is used and then study its data sheet. That should give you a good start.

BTW, this site sells some very high current R/C servo amps: http://www.robotpower.com/

RC-CAM

[Zlatko]

I should also add that Mr.RC-CAM has also been helpful to me and my strange requests in the past :). Thank you Mr.RC-CAM .

Mr.RC-CAM , would you be interested in doing a PIC based ( say 12F683 based ) "servo driver" with your flair? ( digital/analog pulse decoding, pot sensing, H-bridge driving ... high resolution ).

I know there has been some talk about this in this forum before ( about http://www.mstar2k.com/servo.htm ).

Cheers

[Mr.RC-CAM]

Thanks for the kind words (glad to help where I can). I have thought about creating a digital servo amp using a PIC, but the mstar2K (PositionStar) Digital Servo beat me to it.

If enough folks contact the PositionStar creator to tell him they want it, then that project may actually get published. It has been on hold for a year or so, so that might mean the interest/feedback has not been high enough for him. I know how that can take the steam out of all the work it takes to create (and publish) these little R/C designs. Sometimes more cheerleaders are needed to rally up the design team. :)

[coaxial-gyro]

Aye,.. you've both got funny faces !.
When you do a search on the subject it's hard not to just find 555 ic driver projects for a h-bridge kit .

[spankedchrome]

Take a good browse through this link .


links to motor control designs (http://electricmotorpowersystems.com/general.htm)

If anybodys intreasted, lets talk. :)

[spankedchrome]

Look what I thought up as the answer !. (http://www.webcom.com/sknkwrks/mowers.htm) :)