Thermistors

Temperature-dependent resistors: NTC (resistance falls with heat) and PTC (rises).

Easy

NTC 10 kΩ in a divider with an ADC is the cheapest thermometer. Convert with the Beta equation: $\frac{1}{T} = \frac{1}{T_0} + \frac{1}{\beta}\ln\frac{R}{R_0}$ .

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