#include <Ultrasonic.h>
Ultrasonic ultrasonic(6,5);// 6 trig , 5 echo
const int buzzer = 7; // pin buzzer
void setup(){
pinMode(buzzer,OUTPUT);
}
void loop(){
int dist = ultrasonic.Ranging(CM);
if (dist < 100) {
tone(buzzer,1000);
delay(40);
noTone(buzzer);
delay(dist*4);
}
delay(100);
}