//Program to pulse 2 white LEDs for J. Pasachoff. Written by Jason Mativi, Williams College.
//LED1: pulse with a period of 5.4s.
//LED2: pulse with a period of 10s, about 3 times brighter than LED1.

int counterOne = 1;
long counterTwo = 1L;
int incrementOne = 1;
int incrementTwo = 1;
int LEDOneLimit = 85;
int LEDTwoLimit = 250;
int LEDOneOutput = 0;
int LEDTwoOutput = 0;
int cOneLimit = 27000; //Very near 5.4s
long cTwoLimit = 50000L; //Very near 10s

void setup()
{
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  digitalWrite(3, LOW); //GND for LED
  digitalWrite(7, LOW); //GND for LED

  //Only needed if debugging code below is active
  //Serial.begin(9600);
}

void loop()
{
  if(counterOne >= cOneLimit || counterOne <= 0)
  {
    incrementOne = incrementOne * -1;
  }
  if(counterTwo >= cTwoLimit || counterTwo <= 0)
  {
    incrementTwo = incrementTwo * -1;
  }

  counterOne = counterOne + incrementOne;
  counterTwo = counterTwo + incrementTwo;
  
  LEDOneOutput = map(counterOne, 0, cOneLimit, 0, LEDOneLimit);
  LEDTwoOutput = map(counterTwo, 0, cTwoLimit, 0, LEDTwoLimit);

  analogWrite(6, LEDOneOutput);
  analogWrite(5, LEDTwoOutput);

  //For debugging and figuring out time
  /*Serial.print(millis());
  Serial.print("   ");
  Serial.print(counterOne);
  Serial.print("   ");
  Serial.println(counterTwo);*/
}