Temperature variable voltage dividers can easily be made with a thermistor and fixed resistor.

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More heat leads to a lower resistance for a NTC thermistor, whereas a PTC thermistor has a higher resistance as heat goes up. I only have NTC thermistors.

Circuit diagram:

I simply use this circuit to touch the NTC thermistor to a large heated resistor in the video. Any heated/cooled item can be used in place of the heated resistor.

My NTC thermistor is close to 10KΩ at room temperature. So dividing the supply voltage with a 10K resistor gives about half supply voltage at room temperature.

Voltage goes up with heat and down with cold in relationship to room temperature in the circuit shown.

Video:

Quick voltage divider using thermistor NTC Negative Temperature Coefficient demonstration circuit



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