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nodemcu-firmware/docs/en/modules/dac.md

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DAC Module

Since Origin / Contributor Maintainer Source
2018-10-14 Arnim Läuger Arnim Läuger dac.c

The DAC module provides access to the two built-in Digital to Analog Converters.

Each DAC is assigned to a dedicated GPIO:

  • DAC channel 1 is attached to GPIO25
  • DAC channel 2 is attached to GPIO26

The DACs are 8-bit, thus the output values are restricted to the range from 0 to 255.

dac.disable()

Disables DAC output on the related GPIO.

Syntax

dac.disable(channel)

Parameters

  • channel DAC channel, one of
    • dac.CHANNEL_1
    • dac.CHANNEL_2

Returns

nil

An error is thrown in case of invalid parameters or if the dac failed.

dac.enable()

Enables DAC output on the related GPIO.

Syntax

dac.enable(channel)

Parameters

  • channel DAC channel, one of
    • dac.CHANNEL_1
    • dac.CHANNEL_2

Returns

nil

An error is thrown in case of invalid parameters or if the dac failed.

dac.write()

Sets the output value of the DAC.

Syntax

dac.write(channel, value)

Parameters

  • channel DAC channel, one of
    • dac.CHANNEL_1
    • dac.CHANNEL_2
  • value output value

Returns

nil

An error is thrown in case of invalid parameters or if the dac failed.