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- Digital To Analog Converter
- ===========================
- Overview
- --------
- ESP32 has two 8-bit DAC (digital to analog converter) channels, connected to GPIO25 (Channel 1) and GPIO26 (Channel 2).
- The DAC driver allows these channels to be set to arbitrary voltages.
- The DAC channels can also be driven with DMA-style written sample data, via the :doc:`I2S driver <i2s>` when using the "built-in DAC mode".
- For other analog output options, see the :doc:`Sigma-delta Modulation module <sigmadelta>` and the :doc:`LED Control module <ledc>`. Both these modules produce high frequency PWM output, which can be hardware low-pass filtered in order to generate a lower frequency analog output.
- Application Example
- -------------------
- Setting DAC channel 1 (GPIO 25) voltage to approx 0.78 of VDD_A voltage (VDD * 200 / 255). For VDD_A 3.3V, this is 2.59V::
- #include <driver/dac.h>
- ...
- dac_output_enable(DAC_CHANNEL_1);
- dac_output_voltage(DAC_CHANNEL_1, 200);
- API Reference
- -------------
- .. include:: /_build/inc/dac.inc
- GPIO Lookup Macros
- ^^^^^^^^^^^^^^^^^^
- Some useful macros can be used to specified the GPIO number of a DAC channel, or vice versa.
- e.g.
- 1. ``DAC_CHANNEL_1_GPIO_NUM`` is the GPIO number of channel 1 (25);
- 2. ``DAC_GPIO26_CHANNEL`` is the channel number of GPIO 26 (channel 2).
- .. include:: /_build/inc/dac_channel.inc
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