TriacDimmer/examples/basic_example/basic_example.ino at master · AJMansfield/TriacDimmer · GitHub

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/*
  Basic Example.

  This sketch alternately fades two lights in and out, using a
  digital mains AC dimmer switch board.

  This sketch is meant to be used with one of these boards, or
  something similar:
      https://www.amazon.com/Dimmer-Module-Controller-Arduino-Raspberry/dp/B06Y1GVG26
      https://mdwdz.en.alibaba.com/product/60670737878-804998378/2CH_AC_LED_Light_Dimmer_Module_Controller_Board.html
      http://www.inmojo.com/store/krida-electronics/item/2-channel-ac-led-bulb-dimmer-module-v2/

  While this sketch is meant to be used with a dual-channel dimmer,
  it can also control just a single channel (just leave the second
  channel disconnected).

  Note that the circuit here uses high-voltage mains AC power - make
  sure you understand the risks and take appropriate precautions.

  The circuit:
  * Pin 8 is connected to the dimmer 'sync' pin.
  * Pin 9 is connected to the dimmer 'ch 1' pin.
  * Pin 10 is connected to the dimmer 'ch 2' pin.
  * The dimmer power input is connected to mains AC power.
  * The dimmer channel 1 and channel 2 outputs are connected
      to lightbulbs or other devices.

  Created 2017-02-23
  By Anson Mansfield

*/

#include <TriacDimmer.h>

// arduino pins
unsigned char sync = 8; //sync pin
unsigned char channel_1 = 9; // channel 1 pin
unsigned char channel_2 = 10; // channel 2 pin

void setup() {
  // initialize the dimmer library.
  TriacDimmer::begin();
}

void loop() {
  // gradually increase brightness over time
  for(float brightness = 0.00; brightness < 1.00; brightness += 0.01){

    // set channel 1 to the brightness value:
    TriacDimmer::setBrightness(channel_1, brightness);

    // invert brightness for channel 2:
    TriacDimmer::setBrightness(channel_2, 1 - brightness);

    delay(20);
  }

  // and back down - decrease brightness over time
  for(float brightness = 1.00; brightness > 0.00; brightness -= 0.01){

    // set channel 1 to the brightness value:
    TriacDimmer::setBrightness(channel_1, brightness);

    // invert brightness for channel 2:
    TriacDimmer::setBrightness(channel_2, 1 - brightness);

    delay(20);
  }

}