void setup() {
  // put your setup code here, to run once:
Serial.begin(9600); //data transfer rate -baud
pinMode(10, OUTPUT); //red led
pinMode(8, OUTPUT); //green led
pinMode(5, OUTPUT); // YELLOW LED
}

void loop() {
  // put your main code here, to run repeatedly:
Serial.println("STOP");
digitalWrite(10, HIGH);
digitalWrite(8, LOW);
digitalWrite(5, LOW );
for (int i = 10; i > 0; i--) {
  Serial.println(i);

delay(1000);
}


Serial.println("GO");
digitalWrite(10, LOW);
digitalWrite(8, HIGH);
digitalWrite(5, LOW);
for (int i = 10; i > 0; i--) {
  Serial.println(i);

delay(1000);
}


Serial.println("SLOW");
digitalWrite(10, LOW);
digitalWrite(8, LOW);
digitalWrite(5, HIGH);
for (int i = 5; i > 0; i--) {
  Serial.println(i);

delay(1000);
}


}