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In this subsystem the go-kart had a physical and remote kill switch installed. The physical kill switch is a single-pole switch wired into the kill circuit of the motor and the remote kill switch is a relay with a wireless remote that has a range of 164 feet. We wired the kill circuit to the normally closed contact so that it worked as a dead man's switch.
On the right of this image, you can see the relay that the switch connect too. This relay is wired into the power and ground of the motor so it can determine if the motor runs or doesn't. On the left is the physical kill switch.
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