krida-SparkIntervalTimer.ino

#include "SparkIntervalTimer/SparkIntervalTimer.h"

//SYSTEM_MODE (MANUAL);

volatile int i = 0;               // Variable to use as a counter volatile as it is in an interrupt
volatile boolean zero_cross = 0;  // Boolean to store a "switch" to tell us if we have crossed zero
int AC_pin = D7;                // Output to Opto Triac
int dim = 0;                    // Dimming level (0-128)  0 = on, 128 = 0ff
int inc = 1;                      // counting up or down, 1=up, -1=down

int freqStep = 65;    // This is the delay-per-brightness step in microseconds.
                      // For 60 Hz it should be 65
// It is calculated based on the frequency of your voltage supply (50Hz or 60Hz)
// and the number of brightness steps you want.

void zero_cross_detect();
int PIN_ZERO_CROSS = D2;
volatile int zeroCross = 0;
IntervalTimer timer;

void setup()
{
  Serial.begin(9600);
  pinMode(PIN_ZERO_CROSS, INPUT);
  pinMode(AC_pin, OUTPUT);                          // Set the Triac pin as output
  timer.begin(dim_check, freqStep, uSec, TIMER5);
  attachInterrupt(PIN_ZERO_CROSS, zero_cross_detect, RISING, 0);    // Attach an Interupt to Pin 2 (interupt 0) for Zero Cross Detection
}

void zero_cross_detect() {
  zero_cross = true;               // set the boolean to true to tell our dimming function that a zero cross has occured
  i=0;
  digitalWrite(AC_pin, LOW);       // turn off TRIAC (and AC)
}

// Turn on the TRIAC at the appropriate time
void dim_check() {
  //Serial.println("DIM CHECK");
  if(zero_cross == true) {
    if(i>=dim) {
      digitalWriteFast(AC_pin, HIGH); // turn on light
      i=0;  // reset time step counter
      zero_cross = false; //reset zero cross detection
    }
    else {
      i++; // increment time step counter
    }
  }
}

void loop() {
  dim+=inc;
  if((dim>=128) || (dim<=0))
    inc*=-1;
  delay(10);
}