Standard servos do NOT expose position feedback to external devices without modification. There is a way to "sense" position but it's a little complex.
I've always wanted to try it, but haven't gotten around to it yet.
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Wow - 2006. I guess I'm an old-timer, remembering stuff like that.
Edit (from the link):
Hobby Servo Position Tracking Application 04-18-2006
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Coded by Beau Schwabe (Parallax)
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Sensing the position of a standard Hobby Servo? It can be done.
Theory of Operation:
If you supply just enough current to a servo for the internal electronics
to function, but not quite enough to power the servo motor. You can detect
the servo position simply by sweaping a valid servo pulse to the servo and
monitoring the current or voltage drop where the servo electronics attempt
to energize the motor and making note of the swept pulse width.
Two choices: you can tap into the servo's existing pot and read that voltage using an A/D converter, or you can mechanically add a second pot to the servo's output shaft and read that with RCtime.
shaky5292
Posts: 3
Comments
Standard servos do NOT expose position feedback to external devices without modification. There is a way to "sense" position but it's a little complex.
http://forums.parallax.com/showthread.php?84991-Propeller-Application-Proportional-feedback-from-a-Standard-Hobby-Servo-%28Upda&p=582447
I've always wanted to try it, but haven't gotten around to it yet.
====================
Wow - 2006. I guess I'm an old-timer, remembering stuff like that.
Edit (from the link):
There are more expensive servos like the:
http://www.trossenrobotics.com/dynamixel-ax-12-robot-actuator.aspx
that incorporate a feedback mechanism.
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This is for use with the RCTIME statement.
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See Experiment#26 in the StampWorks Manule.
http://www.parallax.com/Portals/0/Downloads/docs/books/sw/Web-SW-v2.1.pdf
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Welcome to the forums.