DAC

About

DAC (digital to analog converter) is a very common peripheral used to convert a digital signal to an analog form.

ESP32 and ESP32-S2 have two 8-bit DAC channels. The DAC driver allows these channels to be set to arbitrary voltages.

DACs can be used for generating a specific (and dynamic) reference voltage for external sensors, controlling transistors, etc.

ESP32 SoC

DAC_1 pin

DAC_2 pin

ESP32

GPIO 25

GPIO 26

ESP32-S2

GPIO 17

GPIO 18

Arduino-ESP32 DAC API

dacWrite

This function is used to set the DAC value for a given pin/DAC channel.

void dacWrite(uint8_t pin, uint8_t value);
  • pin GPIO pin.

  • value to be set. Range is 0 - 255 (equals 0V - 3.3V).

dacDisable

This function is used to disable DAC output on a given pin/DAC channel.

void dacDisable(uint8_t pin);
  • pin GPIO pin.