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The purpose of this post, is to pass on some ideas for the detection of a switch closure at long distances. It is based on a circuit that I use for the trip system at a ski field, which operates in a normally closed system, in order to detect trips and cable faults. In reading several posts...

Here's a couple of quick pics of a BOT I made. It was inspired to use for a classroom project on problem solving, in a maze environment. The commercial product while much faster, was too quick for the children, and the "feelers" on the touch sensors used to bend, and affect the repeatability...