//Traffic Light
const int redLedPin = 5;
const int yellowLedPin = 6; 
const int greenLedPin = 7; 
const int buttonPin = 4;

int lastButtonState = 0;
int buttonState = 0;
bool sequenceRunning = false;

void setup() {
  Serial.begin(9600);
  Serial.println("Press button to toggle traffic light!");
  
  pinMode(buttonPin, INPUT_PULLUP); //internal PULLUP Resistor
  
  pinMode(redLedPin, OUTPUT);
  pinMode(yellowLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);

  //Start states of LEDs
  digitalWrite(redLedPin, LOW);
  digitalWrite(yellowLedPin, LOW);
  digitalWrite(greenLedPin, HIGH);
}

void trafficLightSequence() {
  delay(1000);
  //yellow
  digitalWrite(greenLedPin, LOW);
  digitalWrite(yellowLedPin, HIGH);
  delay(2000);

  //red
  digitalWrite(redLedPin, HIGH);
  digitalWrite(yellowLedPin, LOW);
  delay(10000);

  //red+yellow
  digitalWrite(redLedPin, HIGH);
  digitalWrite(yellowLedPin, HIGH);
  delay(2000);

  //green
  digitalWrite(redLedPin, LOW);
  digitalWrite(yellowLedPin, LOW);
  digitalWrite(greenLedPin, HIGH);
}

void loop() { 
  // Read the value of pin 4.
  buttonState = digitalRead(buttonPin);
  //Serial.print(buttonState);
  
  // Check if the button is pressed
  if (buttonState == LOW && lastButtonState == HIGH && !sequenceRunning) {
    sequenceRunning = true;
    Serial.println("Button pressed...");
    trafficLightSequence();
    sequenceRunning = false;
  }

  lastButtonState = buttonState; // Update the last button state

  //Refresh frequence
  //delay(250);
}