8. 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.