nodemcu-firmware/docs/modules/dac.md

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.