servo operation

[chuckd]

Hello,

I am using a servo for an electronics project that only requires the servo to be fully rotated CW or CCW, I dont need for it to be in any other position. I've only found one datasheet for a Parallax brand which explains the PWM control. My question is if I apply 0 volts or ground to the control wire will the servo rotate until the end of its range in one direction? And if I apply 6 volts will it rotate until the end of its range in the other direction? Also, the Parallax datasheet specified a range of 180 degrees, do the typical RC servos have a range of 90 degrees (as Wikipedia suggests)?

Thanks for any feedback,
Chuck

 

[BobK]

If it is a hobby servo, it requires a series of pulses on the control wire. 1.0 ms is fully CCW and 2.0ms is fully CW. The pulses need to be repeated aout 50 times / second. You cannot control the position with a voltage. The usual angle is 90 degrees, though they will typically go further than this with pulses that are out of spec.

Bob

 

[chuckd]

Thanks for the input Bob. I will use a PIC.

 

[BobK]

Thanks for the input Bob. I will use a PIC.

Good choice. I have a PIC low-pin-count demo board sitting on my desk next to me with a servo controlled by the pot on the board. I could send you the code if want as a starting point.

Bob

 

[chuckd]

Thanks for the offer, but my application is going to be a bit different since the control signal will be transmitted via an ethernet connection.

Chuck