I am trying to create a circuit that uses a specific resistance (actually it'd be great to have it work off of 2 specific resistances but I can create 2 circuits if need be) to apply power to a normally closed relay causing it to cut power to a system. I can read circuit diagrams and solder and understand electronics well, but I don't know how to go about doing this. Id imagine I will need a micro controller, but I'm not sure which. Any help is much appreciated.
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