NTC and Voltage Divider
I have created a circuit on the Falstad website, and you can download the voltage-divider-thermistor.circuitjs.txt file to import and experiment with. This setup is similar to what we covered in the Voltage divider chapter. If you haven't gone through that section, I highly recommend completing the theory there before continuing.
This circuit includes a 10kΩ thermistor(R2) with a resistance of 10kΩ at 25°C. The input voltage \( V_{in} \) is set to 3.3V.
Note: When you create this voltage divider with the microcontroller, the ADC peripheral will convert the Vout to a digital value.
Themistor at 25°C
The thermistor has a resistance of 10kΩ at 25°C, resulting in an output voltage (\( V_{out} \)) of 1.65V.
Thermistor at 38°C
The thermistor's resistance decreases due to its negative temperature coefficient, altering the voltage divider's output.
Thermistor at 10°C
The thermistor's resistance increases, resulting in a higher output voltage (\( V_{out} \)).
These are for illustration purposes only; measurements in your thermistor may not be exactly the same.