int ledB =5;
int ledR = 7;
int buz=3;
void setup() {
pinMode(ledB, OUTPUT);
pinMode(ledR, OUTPUT);
pinMode(buz, OUTPUT);
}
void loop() {
digitalWrite(ledR, HIGH);
digitalWrite(ledB, LOW);
tone(buz,100);
delay(500);
digitalWrite(ledB, HIGH);
digitalWrite(ledR, LOW);
noTone(buz);
delay(500);
}