// Delay-Free Timing 02
//
// In this case, we will set up a bunch of independent timers

// Set variables
// Set up three timers, each with a different offset to check against.
long timer1 = 0; // "long" variables are a special kind of number, which
                 // takes up 4 bytes of space to store (where "int" only takes
                 // up 2 bytes). Range of numbers are from 
                 // -2,147,483,648 to 2,147,483,647. If we left it just an 
                 // "int" we would likely run out of numbers after only a 
                 // couple of minutes. "long" can last for days of continuous
                 // running.         
int  timer1offset = 1000;                         
long timer2 = 0;           
int  timer2offset = 900;                         
long timer3 = 0;           
int  timer3offset = 800;   
long timer4 = 0;           
int  timer4offset = 700;   
long timer5 = 0;           
int  timer5offset = 600;   
long timer6 = 0;           
int  timer6offset = 500;   

// Setup pins
int ledPin1 = 11;
int ledPin2 = 10;
int ledPin3 = 9;
int ledPin4 = 8;
int ledPin5 = 7;
int ledPin6 = 6;

void setup() {        // The standard stuff...
  Serial.begin(9600); // Setup the serial communications so we can debug
  // Save some vertical space by combining lines
  pinMode(ledPin1, OUTPUT); pinMode(ledPin2, OUTPUT); 
  pinMode(ledPin3, OUTPUT); pinMode(ledPin4, OUTPUT); 
  pinMode(ledPin5, OUTPUT); pinMode(ledPin6, OUTPUT); 
  timer1 = millis(); timer2 = millis(); timer3 = millis();
  timer4 = millis(); timer5 = millis(); timer6 = millis();   
  // Start with all pins on
  digitalWrite(ledPin1,HIGH); digitalWrite(ledPin2,HIGH); 
  digitalWrite(ledPin3,HIGH); digitalWrite(ledPin4,HIGH); 
  digitalWrite(ledPin5,HIGH);  digitalWrite(ledPin6,HIGH); 
}

// Das Loop...
void loop() {
  if((timer1 + timer1offset) < millis() ) {   //Timer 1
     doLED1();              
     timer1 = millis();  
  }
  if((timer2 + timer2offset) < millis() ) {   //Timer 2
     doLED2();              
     timer2 = millis();  
  }
  if((timer3 + timer3offset) < millis() ) {   //Timer 3
     doLED3();              
     timer3 = millis();  
  }
  if((timer4 + timer4offset) < millis() ) {   //Timer 4
     doLED4();              
     timer4 = millis();  
  }
  if((timer5 + timer5offset) < millis() ) {   //Timer 5
     doLED5();              
     timer5 = millis();  
  }
  if((timer6 + timer6offset) < millis() ) {   //Timer 6
     doLED6();              
     timer6 = millis();  
  }
}

// The doLED functions
void doLED1() {
  Serial.print("LED 1: ");
  Serial.println(!digitalRead(ledPin1));
  digitalWrite(ledPin1,!digitalRead(ledPin1));
}
void doLED2() {
  Serial.print("LED 2: ");
  Serial.println(!digitalRead(ledPin2));
  digitalWrite(ledPin2,!digitalRead(ledPin2));
}
void doLED3() {
  Serial.print("LED 3: ");
  Serial.println(!digitalRead(ledPin3));
  digitalWrite(ledPin3,!digitalRead(ledPin3));
}
void doLED4() {
  Serial.print("LED 4: ");
  Serial.println(!digitalRead(ledPin4));
  digitalWrite(ledPin4,!digitalRead(ledPin4));
}
void doLED5() {
  Serial.print("LED 5: ");
  Serial.println(!digitalRead(ledPin5));
  digitalWrite(ledPin5,!digitalRead(ledPin5));
}
void doLED6() {
  Serial.print("LED 6: ");
  Serial.println(!digitalRead(ledPin6));
  digitalWrite(ledPin6,!digitalRead(ledPin6));
}