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Class ADC

Before each use of the ADC module, add the statement from machine import ADC to the top of the Python file.

  • machine.ADC(pin): Creates an ADC object associated with the given pin.
    • pin: Available pins are Pin(1–18).
  • ADC.read(): Reads the ADC and returns the value.
  • ADC.atten(db): Sets the attenuation ratio (i.e. the full-range voltage — for example, the voltage at 11db full range is 3.3V).
    • db: Attenuation ratio.
      • ADC.ATTN_0DB — full range of 1.2V
      • ADC.ATTN_2_5DB — full range of 1.5V
      • ADC.ATTN_6DB — full range of 2.0V
      • ADC.ATTN_11DB — full range of 3.3V
  • ADC.width(bit): Sets the data width.
    • bit: Data bit width.
      • ADC.WIDTH_9BIT — 9-bit data width
      • ADC.WIDTH_10BIT — 10-bit data width
      • ADC.WIDTH_11BIT — 11-bit data width
      • ADC.WIDTH_12BIT — 12-bit data width

Adapted from Python_Tutorial.pdf — Chapter 9, AD Converter