Pomoduino

int green = 13;
int yellow = 7;
int blue = 5;

int ledStateGreen = LOW;
int ledStateBlue = LOW;
long previousMillis = 0;
long interval;

int buttonPin = 2;
int buttonState = 1;
bool pressed = 0;
long pressTime = 0;

int phase = 0;

void setup() {
 pinMode(green, OUTPUT);
 pinMode(yellow, OUTPUT);
 pinMode(blue, OUTPUT);
 pinMode(buttonPin, INPUT_PULLUP);
 digitalWrite(buttonPin, HIGH);
}

void loop() {

// update current time and state of button
unsigned long currentMillis = millis();
int buttonState = digitalRead(buttonPin);

// measure time since last button press
long progress = currentMillis - previousMillis;

// check to see if button has been pressed
// over 2 seconds since last press
// (to prevent multiple presses registering)
if ((pressTime - currentMillis) > 2000){
 if(buttonState == 0){
   pressed = 1;
   pressTime = currentMillis;}
 else{
    pressed = 0;}
}

// phase 0 is "work" phase
// if button has been pressed, add 2 minutes to work timer
if (phase == 0){
 if (pressed == 1){
   interval = 1620000;}

 // if interval is over, record current
 // time for measuring next interval
 if(currentMillis - previousMillis > interval) {
   previousMillis = currentMillis;

 // set green and blue LED states
 if (ledStateGreen == LOW){
   ledStateGreen = HIGH;
   ledStateBlue = LOW;}
 else {
   ledStateGreen = LOW;}

 // apply LED states to LEDs
 // reset interval and switch to "break" phase
 digitalWrite(green, ledStateGreen);
 digitalWrite(blue, ledStateBlue);
 interval = 1500000;
 buttonState = 1;
 phase = 1;
 }
}

else {

 // if button has been pressed, add 2 minutes to break timer
 if (pressed == 1){
 interval = 420000;}

   // if interval is over, record current
   // time for measuring next interval
   if(currentMillis - previousMillis > interval) {
     previousMillis = currentMillis;

   // set blue and green LED states
   if (ledStateBlue == HIGH){;
     ledStateBlue = LOW; }
   else {
     ledStateBlue = HIGH;
     ledStateGreen = LOW;}

 // apply LED states to LEDs
 // reset interval and set to "work" phase
 digitalWrite(green, ledStateGreen);
 digitalWrite(blue, ledStateBlue);
 interval = 300000;
 buttonState = 1;
 phase = 0;
 }
}

// calculate time left in interval
unsigned long timeLeft = (interval - progress);

// if there are less than two minutes left, light up yellow LED
if (timeLeft < 120000) {
  digitalWrite(yellow, HIGH); }
else {
  digitalWrite(yellow, LOW); }

// reset pressed variable
 pressed = 0;
}