int redled=1;
int yellowled=2;
int greenled=3;

void setup() {
  // put your setup code here, to run once:
pinMode(redled, OUTPUT);
pinMode(yellowled, OUTPUT);
pinMode(greenled, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(redled,1); //digitalWrite(redled,on);
delayMicroseconds(200);
digitalWrite(redled,0);  //giditalwrite(redled,off);
delay(200);

digitalWrite(yellowled, HIGH);  //digitalWrite(yellowled,1);
delayMicroseconds(100);
digitalWrite(yellowled, LOW);   //digitalWrite(yellowled,0);
delayMicroseconds(100);

digitalWrite(greenled, HIGH); //digitalWrite(greenled,1);
delayMicroseconds(50);
digitalWrite(greenled, LOW); //digitalWrite(greenled,0);
delayMicroseconds(50);

}