// Project 2 Traffic lights Arduino
int ledDelay = 500; // delay in betwenn changes
int redPin = 10;
int yellowPin = 9;
int greenPin = 8;

void setup() {
pinMode(redPin, OUTPUT); 
pinMode(yellowPin, OUTPUT); 
pinMode(greenPin, INPUT_PULLUP);
}

void loop() {
digitalWrite(redPin, HIGH); // turn the red light on 
delay(ledDelay); // wait 5 seconds

digitalWrite(yellowPin, HIGH); // turn on yellow 
delay(2000); // wait 5 seconds


digitalWrite(greenPin, HIGH); // turn green on 
digitalWrite(redPin, LOW); // turn red off 
digitalWrite(yellowPin, LOW); // turn yellow off 
delay(ledDelay); // wait leddelay millisecond

digitalWrite(yellowPin, HIGH); // turn yellow on 
digitalWrite(greenPin, LOW); // turn green on 
delay(2000); // wait 2 seconds


digitalWrite(yellowPin, LOW); // turn yellow off

// now our loop repeats
 }