SunFounder ESP32 Starter Kit
4.9.2 You Will Learn
• Thermistor working principle
• Multivariable and Subtractive Operations
4.9.3 Build the Circuit
A thermistor is a type of resistor whose resistance is strongly dependent on temperature, more so than in standard
resistors, and there are two types of resistors, PTC (resistance increases as temperature increases) and PTC (resistance
decreases as temperature increases).
Build the circuit according to the following diagram.
One end of the thermistor is connected to GND, the other end is connected to pin35, and a 10K resistor is connected
in series to 5V.
The NTC thermistor is used here, so when the temperature rises, the resistance of the thermistor decreases, the voltage
division of pin35 decreases, and the value obtained from pin35 decreases, and vice versa increases.
4.9. 2.6 Low Temperature Alarm 507
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