int buzzer = 11;
int i=0;
void setup()
{
pinMode(12, OUTPUT);
pinMode(10, OUTPUT);
}
void loop()
{
digitalWrite(12, HIGH);
tone(buzzer,450);
delay(1000);
digitalWrite(12, LOW);
noTone(buzzer);
delay(2000);
digitalWrite(10, HIGH);
tone(buzzer,300);
delay(1000)...