How to build Temperature Monitor

October 12, 2010 - category: Temperature sensor

Circuit diagram:

Temperature Monitor-Circuit diagram


Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the opamp and energize the relay and light the LED. Swapping the position of the< thermistor and 47k resistor makes a cold or frost alarm.

author: Andy Collinson
circuit from http://www.zen22142.zen.co.uk/

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