int LEDgreen=12;
int LEDorange=11;
int LEDred=10;
int buzzerPin1=9;

void setup() {
  // put your setup code here, to run once:
pinMode (LEDgreen, OUTPUT);
pinMode (LEDorange, OUTPUT);
pinMode (LEDred, OUTPUT);
pinMode (buzzerPin1, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite (LEDgreen, HIGH);
tone (buzzerPin1, 200); 
delay (2000);
digitalWrite(LEDgreen, LOW);
noTone(buzzerPin1);
delay(1500);
digitalWrite(LEDorange, HIGH);
tone(buzzerPin1, 200);
delay(2000);
digitalWrite(LEDorange, LOW);
noTone(buzzerPin1);
delay(1500);
digitalWrite(LEDred, HIGH);
tone(buzzerPin1, 200);
delay(2000);
digitalWrite(LEDred, LOW);
noTone(buzzerPin1);
delay (1500);
}