A thermistor is a resistor that changes in value according to it’s heat. In actual fact all resistors change in value as they heat up or cool down, but thermistors are manufactured to show a large resistance change.
By placing the thermistor as the top or bottom resistor in a potential divider circuit varying temperatures can be turned into varying voltages which a PICAXE can read.
Thermistor response is not linear, and so the readings will not change in exactly the same way as with a potentiometer. In general there is a larger resistance change at lower temperatures.
Because of this non-linear response and the need to calibrate for a particular sensor chosen it is often easier and more convenient to use a digital temperature sensor such as the DS18B20.
A thermistor (and 10k pull down resistor) may be connected to the generic terminal block create module.
Bill of Materials
|Miniature disc thermistor ||SEN005 ||1 ||Buy Now |
|10k resistor (pack 100) ||RES10K ||1 ||Buy Now |
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