// define the pins for the traffic light
int redPin = 8;
int yellowPin = 9;
int greenPin = 10;

void setup() {
  // set the traffic light pins as outputs
  DDRB = B00111;
}

void loop() {
  // turn the red light on for 3 seconds
  PORTB = B100;
  delay(3000);
  
  // turn the yellow light on for 1 seconds
  PORTB = B010;
  delay(1000);
  
  // turn the green light on for 3 seconds
  PORTB = B001;
  delay(3000);
  
 
  
  
}