Hi,
I need to measure the displacement of an arm,I need to know the exact position all the time.With a really big precission.
I've been thinking in:
-Rotatory encoder, which I could count revolutions and get the position.
-Magnectic sensor, in this case, im not sure because i need a range between 0 and 30 cm.
-Optical sensor,the same as magnetic sensor.
In this case, which would be the cheapest option? the more reliable?
Thanks!!