Perform analog I/O using the GrovePi.

Analog reads return 10-bit values (0-1023) from analog to digital converters on the GrovePi. These values map to voltages between 0 and 5 volts. Analog writes generate a steady square wave on supported pins (also called PWM). The connectors and pins on the GrovePi and GrovePiZero boards differ in their support for analog reads and writes.

When in doubt, consult the following diagram or the corresponding one for the GrovePiZero:

Analog reads can be performed on pins A0, A1, A2, and A3. For most Grove analog sensors, the proper pin to use is the one labeled on the port.

Analog writes only work on the PWM pins. E.g., pins 3, 5, 6, and 9. Just like the reads, for most Grove sensors, the proper pin to use is the same as the one labeled on the port.

Example use:

iex> pin = 3
iex> GrovePi.Analog.read(pin)
971
iex> GrovePi.Analog.write(pin, 200)
:ok