Motion Detection

With the motion detection system used, this device will be able to determine the moment of slip within 0.1 seconds of it actually happening. The type of motion detection that was chosen for this device was an infrared emitter and detector. An infrared sensor was chosen because there will be a change in the voltage reading as soon as the infrared beam moves; making for the best response time. It was also chosen because of the ability to be used to determine the RPM of the ball if the dynamic friction is desired.

The figure above shows a bread board configuration of the circuit that will be used to set up the infrared emitter and detector. With this setup, a voltage reading of 4.5V is observed when the infrared beam is blocked. This voltage reading drops to only 0.67mV when the emitter is reading the infrared beam. The circuit for the emitter and detector will then be put onto their on circuit board and will be tested to make sure that it produces similar results to that of the bread board.

These two circuits then need to be implemented into the overall structure of the device. The circuit with the infrared emitter will be attached to the horizontal sliding mechanism and will be pointed to the detector which will be attached to the grippers. That way as soon as the grippers start to rotate the emitter will no longer be receiving the infrared beam.