The circuit reads the temperature from the LM35 sensor, displays the values in the serial monitor, and lights up the corresponding LED: Red LED: Temperature ≥ 30°C; Yellow LED: Temperature ≤ 20°C; ...

To use the temperature sensor, connect the NTC 10k thermistor to the Arduino according to the circuit diagram, and upload the code to the Arduino board. Open the serial monitor in the Arduino IDE to ...