int LEDred=12;
int LEDyellow=11;
int LEDgreen=10;
int buzzPin1=9;


void setup() {
  // put your setup code here, to run once:
pinMode (LEDred, OUTPUT);
pinMode (LEDyellow, OUTPUT);
pinMode (LEDgreen, OUTPUT);
pinMode (buzzPin1, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite (LEDred, HIGH);
tone (buzzPin1, 500);
delay (500);
digitalWrite(LEDred, LOW);
delay (500);
digitalWrite(LEDyellow, HIGH);
tone (buzzPin1, 600);
delay(500);
digitalWrite (LEDyellow, LOW);
delay(500);
digitalWrite (LEDgreen, HIGH);
tone(buzzPin1, 700);
delay(500);
digitalWrite (LEDgreen, LOW);
delay(500);
}