need an angle sensor

[pravinchanm]

I need to measure the angle between two robotic arms at the joint... i need some precise and simple sensor(analog or digital). I had already tried it with potentiometer but its not much precise...

 

[shrtrnd]

Rotary encoder, google it.

 

[Laplace]

For a digital position encoder, see: http://www.qsl.net/oe5jfl/encoder.htm