Arduino sunrise simulator

sunrise_simulator

int duty = 0;
int steps = 256; //no. of light levels
int sunrisespeed = 20;//no. of pulses, change to ~5400 to have 30min-long sunrise
int minutesUntilSunrise = 0; //change to time until sunrise in minutes
int i;
int j;
int pulsepin = 9;
unsigned long currentMillis = 0;
int previousMillis = 0;
int currentMinutes = 0;


const unsigned char cie[256] = {
	0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 
	1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 
	2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 
	3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 
	5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 
	7, 8, 8, 8, 8, 9, 9, 9, 10, 10, 
	10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 
	13, 14, 14, 15, 15, 15, 16, 16, 17, 17, 
	17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 
	22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 
	28, 28, 29, 29, 30, 31, 31, 32, 32, 33, 
	34, 34, 35, 36, 37, 37, 38, 39, 39, 40, 
	41, 42, 43, 43, 44, 45, 46, 47, 47, 48, 
	49, 50, 51, 52, 53, 54, 54, 55, 56, 57, 
	58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 
	68, 70, 71, 72, 73, 74, 75, 76, 77, 79, 
	80, 81, 82, 83, 85, 86, 87, 88, 90, 91, 
	92, 94, 95, 96, 98, 99, 100, 102, 103, 105, 
	106, 108, 109, 110, 112, 113, 115, 116, 118, 120, 
	121, 123, 124, 126, 128, 129, 131, 132, 134, 136, 
	138, 139, 141, 143, 145, 146, 148, 150, 152, 154, 
	155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 
	175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 
	196, 198, 200, 202, 204, 207, 209, 211, 214, 216, 
	218, 220, 223, 225, 228, 230, 232, 235, 237, 240, 
	242, 245, 247, 250, 252, 255, 
};


void setup()
{
  pinMode(pulsepin, OUTPUT);
}



void loop(){
  if(millis() >= previousMillis+86400000){
    // a full day has elapsed, reset the clock;
   previousMillis +=86400000;
   }
   currentMillis = millis() - previousMillis; // this keeps our currentMillis the same each day
   currentMinutes = (currentMillis/1000)/60;
  
 // turn this on for debugging
   //digitalWrite(pulsepin, LOW);
  //delay(2000);
  Serial.begin(9600);
  if(currentMinutes >= minutesUntilSunrise){
    for (i=0; i<steps; i++)
      {
        duty = 20*cie[i];
        Serial.println(duty); 
        Serial.println(5120-duty);
        for (j=0; j<sunrisespeed; j++)
          {
            // one pulse of PWM
            if(duty > 0){
            digitalWrite(pulsepin, HIGH);
            delayMicroseconds(duty);
            }
            digitalWrite(pulsepin, LOW);
            delayMicroseconds(5120-duty);
          }   

  }
  Serial.println("Sunrise ended");  
  digitalWrite(pulsepin, HIGH);
  delay(5000); //change value to how long you'd like the LEDs to shine at full brightness, in milliseconds
  }
}