How to Build a Remote Kill Switch
Contributors:
Nate
Nate 
When Things Get Out of Control
Kill Switches: It's not a question of if, but when.
I highly recommend building something that scares you every once and awhile. In this case, I’m planning to enter an autonomous vehicle into the AVC in 2016, and it's pushing my limits of comfort. A 1,000W motor with a large battery pack behind it mean that if things go wrong, it could be dangerous. For that reason, one of the new safety requirements of the AVC is a remote kill switch that allows the user to remotely power down the vehicle. This tutorial is my solution to safely disconnecting the motor from the motor controller in case things get out of control...
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Here's a quick video showing the kill switch controlling the 1kW motor (that just happens to be attached to a blender).