71 lines
2.2 KiB
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71 lines
2.2 KiB
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ESP32 DAC
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=========
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.. seo::
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:description: Instructions for setting up ESP32 digital-to-analog converter.
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:image: dac.svg
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The ESP32 DAC platform allows you to output analog voltages using the 8-bit digital-to-analog
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converter of the ESP32. Unlike the :doc:`/components/output/ledc`, which can simulate an analog
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signal by using a fast switching frequency, the hardware DAC can output a *real* analog signal with
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no need for additional filtering.
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The DAC spans across two pins, each on its own channel: GPIO25 (Channel 1) and GPIO26 (Channel 2).
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The output level is a percentage of the board supply voltage (VDD_A) - generally this will be 3.3 V.
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.. code-block:: yaml
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# Example configuration entry
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output:
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- platform: esp32_dac
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pin: GPIO25
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id: dac_output
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# Example usage
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on_...:
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then:
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- output.set_level:
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id: dac_output
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level: 50%
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# Use the DAC output as a light
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light:
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- platform: monochromatic
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output: dac_output
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gamma_correct: 1.4
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id: dac_output
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Configuration variables:
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------------------------
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- **pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The pin to use DAC on. Only GPIO25
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and GPIO26 are supported.
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- **id** (**Required**, :ref:`config-id`): The id to use for this output component.
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- All other options from :ref:`Output <config-output>`.
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Use Cases
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---------
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- Generating a specific (and dynamic) reference voltage for an external sensor or ADC, such as the
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:doc:`/components/sensor/ads1115`
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- Controlling the bias of a transistor
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- Driving a bar graph or large amount of LEDs using an analog-controlled LED driver like the LM3914
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(`datasheet <https://www.ti.com/lit/ds/symlink/lm3914.pdf>`__); this can allow you to make tank
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level indicators, temperature gauges, and so on from a single output pin
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- Generating 0-10 V for a dimmable light (operational amplifier required)
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See Also
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--------
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- :doc:`/components/output/index`
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- :doc:`/components/output/ledc`
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- :doc:`/components/output/esp8266_pwm`
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- :doc:`/components/light/monochromatic`
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- :doc:`/components/fan/speed`
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- :doc:`/components/power_supply`
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- :apiref:`esp32_dac/esp32_dac.h`
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- :ghedit:`Edit`
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