Introduction to Python and Microcontrollers

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

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