Safe AC dimmer with code

[Dbagioni]

All

Has anyone found a safe and reliable dimmer code to with with an AC dimmer? I have been racking my brains and cant find a good working code. I'm using commercially made pwm/zero cross dimmers from RobotDYN(see picture). I can get a 12 volt version working but have been unsuccessful in getting this to work. Disclaimer - Im a hardware guy not a code guy.

My end goal would be to get it working with the rotary encoder. This is the RAW pwm/zero crossing code.

#include "hw_timer.h"
#include <Time.h>
#include <TimeLib.h>
#include <TimeAlarms.h>

//Pin Setups
const int zcPin = 12; //zero-cross detection pin D6
const int pwmPin = 13;  //pwm pin - fires the triac D7

//Dimmer Settings including fades.
byte fade = 1;
byte state = 1;
byte tarBrightness = 255; //"target" brightness - going to have go convert this to a precentage for OH
byte curBrightness = 0; //current brightness level
byte zcState = 0; // 0 = ready; 1 = processing;

char lvl[50];

void setup() {
  Serial.begin(115200); //Sets the data rate in bits per second (baud) for serial data transmission.

  //Dimmer pins -set up the pwm and zero cross pins
  pinMode(zcPin, INPUT_PULLUP);
  pinMode(pwmPin, OUTPUT);
  attachInterrupt(zcPin, zcDetectISR, RISING);    // Attach an Interupt to Pin 2 (interupt 0) for Zero Cross Detection
  hw_timer_init(NMI_SOURCE, 0);
  hw_timer_set_func(dimTimerISR);

 } // END SETUP

void dimTimerISR() {
  if (fade == 1) {
    if (curBrightness > tarBrightness || (state == 0 && curBrightness > 0)) {
      --curBrightness;
    }
    else if (curBrightness < tarBrightness && state == 1 && curBrightness < 255) {
      ++curBrightness;
    }
  }
  else {
    if (state == 1) {
      curBrightness = tarBrightness;
    }
    else {
      curBrightness = 0;
    }
  }

  if (curBrightness == 0) {
    state = 0;
    digitalWrite(pwmPin, 0);
  }
  else if (curBrightness == 255) {
    state = 1;
    digitalWrite(pwmPin, 1);
  }
  else {
    digitalWrite(pwmPin, 1);
  }

  zcState = 0;
}

void zcDetectISR() {
  if (zcState == 0) {
    zcState = 1;

    if (curBrightness < 255 && curBrightness > 0) {
      digitalWrite(pwmPin, 0);

      int dimDelay = 30 * (255 - curBrightness) + 400;//400
      hw_timer_arm(dimDelay);
    }
  }
}

Can anyone help?

[Michiel van der Wulp]

@Dbagioni said in Safe AC dimmer with code:

zcPin

Which pin do you use? The comments say something else (twice) than the code.
Which CPU do you use?
For many Arduinos, you can only use pin 2 and 3.

[Dbagioni]

The code I posted is the raw code for the zero-cross dimmer. When I had tried to merge the "dimmer with rotary encoder" sketch and the zero-cross code I had wired it up with the ZC pin as 2 and the PWM pin on 3. Encoder was wired: SW pin on 4, CLK pin on 5 and CE pin on 6. 7/8/A2 were used for status LED's.

I was running it with an older NANO with the 328.