This is a simple design circuit for contact detector circuit. Here’s the figure of the circuit;
The robot's obstacle detection circuit will only inform the robot that there is an obstacle, not the distance between the obstacle and the robot. Therefore contact sensors are needed for the robot to determine that it has made contact or dumped into an object. This circuit above is a simplest solution that can be use for micro switches. There are four micro switches (one on each side of the robot), connected to The Handy board's digital ports.
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