70 lines
1.4 KiB
Markdown
70 lines
1.4 KiB
Markdown
# DAC Module
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| Since | Origin / Contributor | Maintainer | Source |
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| :----- | :-------------------- | :---------- | :------ |
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| 2018-10-14 | [Arnim Läuger](https://github.com/devsaurus) | [Arnim Läuger](https://github.com/devsaurus) | [dac.c](../../../components/modules/dac.c)|
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The DAC module provides access to the two built-in Digital to Analog Converters.
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Each DAC is assigned to a dedicated GPIO:
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- DAC channel 1 is attached to GPIO25
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- DAC channel 2 is attached to GPIO26
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The DACs are 8-bit, thus the output values are restricted to the range from 0 to 255.
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## dac.disable()
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Disables DAC output on the related GPIO.
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#### Syntax
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```lua
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dac.disable(channel)
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```
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#### Parameters
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- `channel` DAC channel, one of
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- `dac.CHANNEL_1`
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- `dac.CHANNEL_2`
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#### Returns
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`nil`
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An error is thrown in case of invalid parameters or if the dac failed.
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## dac.enable()
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Enables DAC output on the related GPIO.
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#### Syntax
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```lua
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dac.enable(channel)
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```
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#### Parameters
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- `channel` DAC channel, one of
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- `dac.CHANNEL_1`
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- `dac.CHANNEL_2`
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#### Returns
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`nil`
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An error is thrown in case of invalid parameters or if the dac failed.
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## dac.write()
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Sets the output value of the DAC.
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#### Syntax
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```lua
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dac.write(channel, value)
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```
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#### Parameters
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- `channel` DAC channel, one of
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- `dac.CHANNEL_1`
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- `dac.CHANNEL_2`
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- `value` output value
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#### Returns
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`nil`
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An error is thrown in case of invalid parameters or if the dac failed.
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