void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  if(!Serial) Serial.println("serial is not ok");

pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(11, HIGH);
Serial.println("green is on");
delay(2000);
digitalWrite(11, LOW);
Serial.println("green is off");
delay(500);

digitalWrite(12, HIGH);
Serial.println("yellow is on");
delay(2000);
digitalWrite(12, LOW);
Serial.println("yellow is off");
delay(500);


digitalWrite(13, HIGH);
Serial.println("red is on");
delay(2000);
digitalWrite(13, LOW);
Serial.println("red is off");
delay(500);

digitalWrite(12, HIGH);
Serial.println("yellow is on");
delay(2000);
digitalWrite(12, LOW);
Serial.println("yellow is off");
delay(500);

digitalWrite(11, HIGH);
Serial.println("green is on");
delay(2000);
digitalWrite(11, LOW);
Serial.println("green is off");
delay(500);





}