What I'd like to do is create a circuit that will turn on a light when the temperature gets above a certain point. The temperature doesn't have to be really accurate. It can be off by 5 degrees or so. Essentially the light would turn on when it gets hot. Obviously this is pretty easy to do with the …

Conceptual Help With TMP36 (Temperature Sensor)

system May 2, 2014, 8:23pm 6

Thermistors are cheap. You can find some temperature control example circuits here...
http://www.vishay.com/docs/29053/ntcintro.pdf

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