int melody[8] = {262,294,330,349,392,440,494,523};

int TRIG = 3, ECHO = 4, speaker = 7;

void setup() {

Serial.begin(9600);

pinMode(TRIG,OUTPUT);

pinMode(ECHO,INPUT);

pinMode(speaker, OUTPUT);

}

void loop() {

float distance, duration;

digitalWrite(TRIG, HIGH);

delayMicroseconds(1);

digitalWrite(TRIG,LOW);

duration = pulseIn(ECHO,HIGH);

distance = ((float)(duration*340)/10000)/2;

Serial.println(distance);

int i;

if (distance <= 32) {

i=map(distance,0,32,0,7);

tone (speaker, melody[i], 250);

delay (300);

}

else {

noTone(speaker);

}


}