The Lynxmotion Bumper Switch can detect collision in the front /rear of your robot
Switches are rated 5A @ 125VAC, 3A @ 230VAC
Enables your robot to detect a collision with simple micro switches. With a little imagination, this "whisker sensors" can activate some relays, powering the propulsion motor. It is now possible to have a smart robot without microcontrollers. You can connect as well this sensor to a microcontroller such as BASICX-24p-u Microcontroller.