#define g_ledpin 13
#define y_ledpin 12
#define r_ledpin 11
void setup() 
{//setup the digital pin as Outputs.
  pinMode(r_ledpin, OUTPUT);
  pinMode(y_ledpin, OUTPUT);
  pinMode(g_ledpin, OUTPUT);
}
void loop() 
{
  digitalWrite(g_ledpin, HIGH);// Turn on the green LED.
  delay(1000); // Wait for 1 second.
  digitalWrite(g_ledpin, LOW);// Turn off the green LED.
  digitalWrite(y_ledpin, HIGH);// Turn on the yellow LED.
  delay(200); // Wait for 0.2 seconds.
  digitalWrite(y_ledpin, LOW);// Turn off the yellow LED.
  digitalWrite(r_ledpin, HIGH);// Turn on the red LED.
  delay(1000); // Wait for 1 second.
  digitalWrite(r_ledpin, LOW);// Turn off the red LED.
}