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8.Analog to Digital Conversion

The ESP8266 has a single pin (separate to the GPIO pins) which can be used toread analog voltages and convert them to a digital value. You can constructsuch an ADC pin object using:

>>>importmachine>>>adc=machine.ADC(0)

Then read its value with:

>>>adc.read()58

The values returned from theread() function are between 0 (for 0.0 volts)and 1024 (for 1.0 volts). Please note that this input can only tolerate amaximum of 1.0 volts and you must use a voltage divider circuit to measurelarger voltages.