int redLED=2;
int yellowLED=3;
int greenLED=4;
void setup()
{
  pinMode(redLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
}
void loop()
{
  setLight(redLED,5000);
  setLight(yellowLED,1000);
  setLight(greenLED,5000);
  setLight(yellowLED,1000);
 
}
void setLight(int LED, int ms)
{
   digitalWrite(LED, HIGH); delay(ms);
   digitalWrite(LED, LOW);


}