Servo motor help

  • Thread starter hc3
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  • #1
hc3
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I'm building a robot for my junior project design class and I'm using a servo motor. I'm using a 555 timer as a variable speed controller. I was wondering how to get a negative signal from the timer. Any ideas?
 
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Answers and Replies

  • #2
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Ummm, Servos don't have a negative signal, rather the position is maintained relative to the pulse width via the feedback circuit to the position sensor (which is usually a mechanical potentiometer). So you send out pulses at some regular cycle length, eg 50 Hz, and the width of the pulse controls the position -> so a narrow pulse is all the way to CCW and a wider pulse is all the way CW (for example). A 50% of the max pulse length will set it at half way between.
 

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