Counting number of turns

[Abhishek R]

Originally Posted by Pranit T

If you have a light sensor/photoreflective sensor, you can put a pulley in front of it, and paint it half white and half black. Connect the pulley to the motor. You can now track the number of times the motor rotates based on the number of times the light sensor counts it sees the white or black pass by.

You can fine tune this by adding more sections of black/white rather than just one of each colour. We did this on our 2009 bot to tune the PID for the shooting wheel.

This works quite well. We used it in both 2012 and 2013 for our shooter wheels.