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[Reply #15 on:]

Couple more links: http://www.openservo.org/ (see: http://www.openservo.com/StepByStep) and http://code.google.com/p/zosupermodified/

These designs are intended to replace the control board inside an RC servo to give it full positional feedback. The "openservo" hardware is available for purchase but the "supermodified" hardware appears to have fallen off the internet unfortunately

[Reply #16 on:]

Couple more links: http://www.openservo.org/ (see: http://www.openservo.com/StepByStep) and http://code.google.com/p/zosupermodified/

These designs are intended to replace the control board inside an RC servo to give it full positional feedback. The "openservo" hardware is available for purchase but the "supermodified" hardware appears to have fallen off the internet unfortunately

Thanks, I bookmarked all of them for later use. There is clearly much I don't know and I need to read the existing documentation. (Yawn!)

Lou.

[Reply #17 on:]

This is for several uses on a robot. I am looking for a sensor that provides a code for the angular position of a shaft - such as a steering shaft or a disk that rotates a camera mounted on it. The idea is to determine the angle when the shaft is NOT turning. This is not for detecting high-speed changes. What is available?

The total rotation of the range needs to be established for a good solution suggestion. If the stearing shaft only rotates ~45 deg., then a linkage to a pot might suffice. If the cam rotates only 360 deg in range, then a pot might also do using simple gears or a pully setup. 

[Reply #18 on:]

This is for several uses on a robot. I am looking for a sensor that provides a code for the angular position of a shaft - such as a steering shaft or a disk that rotates a camera mounted on it. The idea is to determine the angle when the shaft is NOT turning. This is not for detecting high-speed changes. What is available?

The total rotation of the range needs to be established for a good solution suggestion. If the stearing shaft only rotates ~45 deg., then a linkage to a pot might suffice. If the cam rotates only 360 deg in range, then a pot might also do using simple gears or a pully setup. 

Of course - a single turn pot. Cheap, simple and robust. That was so obvious it never ocurred to me.
Thank you.

[Reply #19 on:]

Seems to be a common problem, measuring angles, specially when it comes to making mobile robots. At the end I had to make my own board, now selling it..I have a few boards on my website ,http://www.asquared.cc/products/

[Reply #20 on:]

Seems to be a common problem, measuring angles, specially when it comes to making mobile robots. At the end I had to make my own board, now selling it..I have a few boards on my website ,http://www.asquared.cc/products/

Very nice. I bookmarked the web page.
Thanks very much.