We're reusing the exact same voltage-divider-plus-ADC trick from the LDR experiment, just swapping the light sensor for a temperature sensor. A thermistor's resistance changes predictably with temperature, and by feeding that into a bit of math called the Beta parameter equation, we can turn a raw voltage reading into an actual temperature in degrees Celsius.

2. Scope

We'll build a thermistor voltage divider identical in structure to Experiment 14's LDR circuit, read it via ADC, and this time actually convert the reading into a calibrated physical unit rather than just a simple threshold comparison. This is a nice step up in complexity, going from a simple yes/no answer to an actual calculated value with real-world meaning.

3. Prerequisite

3.1 Hardware

• STM32 Nucleo-F070RB development board

• NTC Thermistor (10kΩ at 25°C typical, Beta value around 3950, check your specific component's datasheet)

• Fixed resistor (10kΩ, matching the thermistor's nominal value)

• Breadboard and jumper wires

• Micro-USB cable

• PC with PuTTY

3.2 Software

• STM32CubeMX (standalone)

• STM32CubeIDE

• ST-LINK USB driver

• PuTTY, or an equivalent serial terminal app