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I am working on a small robot car at the moment, my prototype works well but I want some more speed. The car starts and stops with a simple micro switch (stopping switch turns off motor when the car impacts the end of the track). When I speed the car up I think I will have trouble stopping it safely within the track.
you don't need to short anything,
just use a normally closed relay and when it gets power across its poles if opens thus shutting off the circuit.
The basic concept of this is that if you short the power and ground leads of your motor, the inductance created by your motor in one direction will power your motor in the opposite direction. Although your motor will still rotate, it will greatly resist the rotation.
That makes a bit more sense than what is going through my head....