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Author Topic: Servo grinding issue  (Read 409 times)

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Offline mewakittyTopic starter

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Servo grinding issue
« on: July 12, 2012, 01:57:33 PM »
Hi everyone,

I am new here :) I am working on a robotic arm. I have 9 S777 servos (I didn't build the arm, so this wasn't my selection). The box they came with the servos says timing is between 1ms and 2ms (so standard). I have code that puts that signal out with a frequency of 50Hz.

Unfortunately, my servos are always grinding. They don't move from their position and instead make the grinding noise. I have varied the pulse width from 1 to 2ms, and there is no difference.

I connected the servo to an external power source (it's high power), so it always supplies 6V. The current spikes whenever I send a signal, and I don't think that should be happening. So I have everything disconnected...

Is there a chance the servos require different timing? Other ideas?

Offline Pogertt

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Re: Servo grinding issue
« Reply #1 on: July 12, 2012, 06:43:09 PM »
Are you providing the 1 to 2 msec pulse at the proper refresh rate?

http://www.pololu.com/blog/17/servo-control-interface-in-detail

Link provides details of timing required.
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