The ESP32 DAC platform allows you to output analog voltages using the 8-bit digital-to-analog converter of the ESP32. Unlike the ESP32 LEDC Output, which can simulate an analog signal by using a fast switching frequency, the hardware DAC can output a real analog signal with no need for additional filtering.
The DAC spans across two pins, each on its own channel: GPIO25 (Channel 1) and GPIO26 (Channel 2).
The output level is a percentage of the board supply voltage (VDD_A) - generally this will be 3.3 V.
# Example configuration entry output: - platform: esp32_dac pin: GPIO25 id: dac_output # Example usage on_...: then: - output.set_level: id: dac_output level: 50% # Use the DAC output as a light light: - platform: monochromatic output: dac_output gamma_correct: 1.4 id: mono_light
Generating a specific (and dynamic) reference voltage for an external sensor or ADC, such as the ADS1115 Sensor
Controlling the bias of a transistor
Driving a bar graph or large amount of LEDs using an analog-controlled LED driver like the LM3914 (datasheet); this can allow you to make tank level indicators, temperature gauges, and so on from a single output pin
Generating 0-10 V for a dimmable light (operational amplifier required)