Bumper Design Here is a design for a bumper. The advantages of this bumper are that it uses only one touch sensor and still covers the whole front of the robot. Moreover, the sensor is on when touched and off otherwise (contrary to many of the designs that come with MindStorms. This means you can multiplex it with other touch or light sensors on one input. It can be made from the pieces of the Robotic Invention System. Here are the instruction: Comments to: markov@cs.uu.nl