Analog to Digital Conversion ============================ The ESP8266 has a single pin (separate to the GPIO pins) which can be used to read analog voltages and convert them to a digital value. You can construct such an ADC pin object using:: >>> import machine >>> adc = machine.ADC(0) Then read its value with:: >>> adc.read() 58 The values returned from the ``read()`` function are between 0 (for 0.0 volts) and 1024 (for 1.0 volts). Please note that this input can only tolerate a maximum of 1.0 volts and you must use a voltage divider circuit to measure larger voltages.