I am just trying to use an ultrasonic sensor with a buzzer but the buzzer doesn't respond to my code. I mean it doesn't make any sound. I tested it to check if by sending 5 volts to it, it will make a sound.. and it did... but using this code below... for some reason, it doesn't make any sound....

#include <NewPing.h>
#define TRIGGER_PIN 11
#define  ECHO_PIN 12
#define buzzer 13

NewPing sonar1 (TRIGGER_PIN, ECHO_PIN);

long inches1;
int sound = 250;

void setup (){

  Serial.begin (9600);

  pinMode (ECHO_PIN, INPUT);
  pinMode (buzzer, OUTPUT);


void loop () {

  inches1 = sonar1.ping_in();  
   if (inches1 <= 5 ){
 //   sound = 250;
    tone(buzzer, 1000); // Send 1KHz sound signal...
    delay(1000);        // ...for 1 sec
    noTone(buzzer);     // Stop sound...
    Serial.print (inches1);
    Serial.print ('\n');
  delay (200);
  • 2
    don't use tone() if it makes sound with 5 V. only set pin HIGH
    – Juraj
    Commented Sep 20, 2019 at 18:45
  • hhhmmmm..... i see... i will try.. thanks for your answer... :) Commented Sep 20, 2019 at 18:48
  • what exit code are you talking about?
    – jsotola
    Commented Sep 20, 2019 at 20:12
  • 1
    What's the whole message the Arduino IDE gives you. Exit 1 usually means you've got a missing library or a syntax error in your code.
    – Dougie
    Commented Sep 21, 2019 at 10:22

1 Answer 1


If you have a look at the complete error message you will see that there is a collision between the libraries NewPing and Tone.

Arduino: 1.8.9 (Windows Store (Windows 10), Board: "Arduino/Genuino Uno"

Tone.cpp.o (symbol from plugin): In function `timer0_pin_port':

(.text+0x0): multiple definition of `__vector_7'

libraries\NewPing\NewPing.cpp.o (symbol from plugin):(.text+0x0): first defined here

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling for board Arduino/Genuino Uno.
  • 1
    yes, but the point is that they don't have to use tone()
    – Juraj
    Commented Sep 21, 2019 at 18:20
  • I agree! But the question is "error" and perhaps someone take in the information that libraries can have conflicts, I have seen it to many times.
    – MatsK
    Commented Sep 24, 2019 at 17:55

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