Table of Contents
Thermistor can be used with one or more fixed resistors, to make a temperature dependent voltage divider.
- NTC (negative temperature coefficient): More heat equals less resistance.
- PTC (positive temperature coefficient): More heat equals more resistance.
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The thermistor in this diagram and video is a NTC (Negative temperature coefficient) version. I forgot to note that in the diagram, or mention it in the video.
A NTC thermistor has a lower resistance as it heats up. Therefore, when wired on the high side of a voltage divider, the signal voltage out will go up as the thermistor heats up.
When cooled down, the NTC thermistor on the high side of the divider will increase resistance, lowering the output signal voltage.
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