DebouncedInterrupt.ino

/*
  Ryan Fleck
  Interrupt Programming Tests
 */

// Light for testing feedback.
const byte ledPIN = 13;

// Interrupt pin zero is digital pin 2.
const byte interruptPIN = 2;
const long debounceDelay = 250; // 40 ms.
long debounceTime;

// Enables/disables testing feedback led.
volatile boolean enabled;

const boolean debug = true;



// the setup routine runs once when you press reset:
void setup() {
  if(debug){
    Serial.begin(9600);
    debugp("Debugging enabled.");
  }
  debugp("Init program.");           
  // initialize the digital pin as an output.
  pinMode(ledPIN, OUTPUT);
  pinMode(interruptPIN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(interruptPIN), first_ISR, FALLING);
  debounceTime = millis();
  enabled=true;
  
}

// the loop routine runs over and over again forever:
void loop() {
  if(enabled){
  digitalWrite(ledPIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(200);
  }
  digitalWrite(ledPIN, LOW);    // turn the LED off by making the voltage LOW
  delay(200);               // wait for a second
}

void first_ISR() {
  if( (millis() - debounceTime) > debounceDelay ){
    debugp("ISR!");
    if(enabled){
      enabled=false;
    }else{
      enabled=true;
    }
    debounceTime = millis();
  }
}

// Only print serial messages when debugging is enabled.
void debugp(String x){
  if(debug){
    Serial.println(x);  
  }
}