#include <TimerOne.h> // Include Timer1 library
#include <SimpleMessageSystem.h> // Include SimpleMessageSystem library

// This is programmed for an Arduino Mega controlling lights from outs 22+
int AC_pin_offset = 22; // lowest out for lights
int dims[18]; // dimmer values
unsigned char clock_tick; // variable for Timer1

void setup() {
  Serial.begin(115200);
  for(int i = 0; i < 18; i++){
    dims[i] = 256;
    // Set the pins to the triacs as outputs (using outs 0 - 17)
    pinMode(AC_pin_offset + i, OUTPUT);   
  };
  attachInterrupt(0, zero_crosss_int, RISING);
  // for resoution of 128 steps, set timer so 33 microseconds for 60 Hz or 39 for 50 Hz 
  Timer1.initialize(39);
  Timer1.attachInterrupt(timerIsr); // attach the service routine here
}

// this is the dimmer
void timerIsr() {
  clock_tick++;
  for(int i = 0; i < 18; i++) {
    if (dims[i] == clock_tick) {
      digitalWrite(AC_pin_offset + i, HIGH); // triac on
      }
  };
}

// function to be fired at the zero crossing to dim the light
void zero_crosss_int() {
  clock_tick=0;
  for(int i = 0; i < 18; i++){
    digitalWrite(AC_pin_offset + i, LOW); // triac Off
  }
}

void loop(){
  int light = 0;
  int val = 0;
  // Checks to see if the message is complete and erases any previous messages
  if (messageBuild() > 0) {
    light = messageGetInt();
    val = messageGetInt();
    dims[light] = val;
  }
}