ESP32ULPDimmer

Allows ESP32 boards to control one AC dimmer using ULP on background. This library does not use interrupts and resources of the main processors.

Usage

1. Include the library in your Sketch:

#include <ESP32ULPDimmer.h>

2. Call int ULPDimmerBegin(const int zc_pin, const int trigger_pin, const unsigned int cycle_freq); // cycle_freq is 50 or 60Hz in your setup() function (The zc_pin and trigger_pin must be ESP32 rtc gpio pins):

void setup() {
  Serial.begin(115200);
  while (!Serial);
  Serial.println("start");

  while (ULPDimmerBegin(25, 26, 60)) {
    Serial.println("Invalid rtc_io pins!");
    delay(100);
  }
  
}

3. Use void ULPDimmerSetDuty(unsigned int duty); // 0 to 100% to set duty cycle. E.g.:

int duty = 0;

void loop() {
  ULPDimmerSetDuty(duty);

  Serial.print("Duty= ");
  Serial.println(ULPDimmerGetDuty());

  duty++;

  if (duty > 100) duty = 0;

  delay(500);
}

Circuit

License

Released under the MIT License. Copyright (C) 2024 Luis Claudio Gambôa Lopes lcgamboa@yahoo.com