parallax continious rotation servos

tedbeau

I just got two parallax cont. rotation servos and have a question concerning the pulse length. I have a copy of Mike Predko's 123 robotic experiments for evil genius and in it when he discusses using rc servos, and how to make a continious rotation servo he says that most servos use a 1 to 2 ms pulse(1 ms one direction, 2 ms the other direction). He then says the Futaba servos use a·max pulse length of 1.5 ms. Since the Parallax servo is a Futaba, should I be using a 1 to 1.5 ms pulse?

Ted

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PAR

tedbeau said...
I just got two parallax cont. rotation servos and have a question concerning the pulse length. I have a copy of Mike Predko's 123 robotic experiments for evil genius and in it when he discusses using rc servos, and how to make a continious rotation servo he says that most servos use a 1 to 2 ms pulse(1 ms one direction, 2 ms the other direction). He then says the Futaba servos use a·max pulse length of 1.5 ms. Since the Parallax servo is a Futaba, should I be using a 1 to 1.5 ms pulse?
·Ted

The Parallax c.r.·servos have the (approx.) 1ms to 2ms range, with (approx.) 1.5ms being the "stopped" position. And, between each of·those repeated pulses is a (approx.) 20ms delay.


PAR

tedbeau

OK one more question, if I stop sending the pulse at 20 ms intervals will the servo simply stop? in other words is it nessecary to send a stop pulse of 1.5ms, and does this need to be repeated every 20ms?

Thanks

Ted

Bean

Ted,
If you stop sending pulses the servo will freewheel. If you send 1.5mSec pulses it will hold it's position.

Bean.

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