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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_out_voltage(DAC_CHANNEL_1, 200);
- API Reference
- -------------
- Header Files
- ^^^^^^^^^^^^
- * `components/driver/include/driver/dac.h`
- Enumerations
- ^^^^^^^^^^^^
- .. doxygenenum:: dac_channel_t
- Functions
- ^^^^^^^^^
- .. doxygenfunction:: dac_out_voltage
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