Using the Builtin Temperature Sensor The Raspberry Pi Pico has an internal temperature sensor that can be access using machine.ADC(4). This might be useful to see if your RP2040 CPY is running "hot" and might benefit from a cooling fan. Reading the temperature 1 2 3 4 5 6 7 8import machine import utime sensor_temp = machine.ADC(4) while True: reading = sensor_temp.read_u16() * conversion_factor temperature = 27 - (reading - 0.706)/0.001721 print(temperature) print('\n') Logging the Temperature 1 2 3 4 5 6 7 8 9 10 11import machine import utime sensor_temp = machine.ADC(machine.ADC.CORE_TEMP) conversion_factor = 3.3 / (65535) file = open("temps.txt", "w") while True: reading = sensor_temp.read_u16() * conversion_factor temperature = 27 - (reading - 0.706)/0.001721 file.write(str(temperature)) file.flush() utime.sleep(10)