#define RED 12
#define Yellow 2
#define GREEN 7

void setup() {

Serial.begin(9600);
pinMode(RED, OUTPUT);
pinMode(Yellow, OUTPUT);
pinMode(GREEN, OUTPUT);

}
void loop() {
  digitalWrite(RED, HIGH);
  digitalWrite(Yellow, LOW);
  digitalWrite(GREEN, LOW);
  Serial.println("Stop!");
delay(1000);

digitalWrite(Yellow, HIGH);
digitalWrite(RED,LOW);
Serial.println("Set.");
delay(1000);

digitalWrite(GREEN, HIGH);
digitalWrite(RED, LOW);
digitalWrite(Yellow, LOW);
Serial.println("Go!");
delay(1000);

digitalWrite(GREEN, LOW);
digitalWrite(RED, LOW);
digitalWrite(Yellow, LOW);
Serial.println("...");
delay(300);

digitalWrite(GREEN, HIGH);
digitalWrite(RED, LOW);
digitalWrite(Yellow, LOW);
Serial.println("...");
delay(300);

digitalWrite(GREEN, LOW);
digitalWrite(RED, LOW);
digitalWrite(Yellow, LOW);
Serial.println("...");
delay(300);

digitalWrite(GREEN, HIGH);
digitalWrite(RED, LOW);
digitalWrite(Yellow, LOW);
Serial.println("...");
delay(300);
}