Arduino tone() Produces No Sound

In this tutorial, you'll learn about Arduino tone() Produces No Sound. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

The Problem

Calling tone() on a buzzer pin produces no audible output.

Quick Fix

Wrong

tone(9, 440);  // No duration specified — plays forever

Buzzer plays 440 Hz continuously with no stop.

Right

int buzzerPin = 9;
void setup() {
  pinMode(buzzerPin, OUTPUT);
}
void loop() {
  tone(buzzerPin, 440, 500);  // 440 Hz for 500 ms
  delay(600);
  noTone(buzzerPin);
  delay(500);
}

Buzzer beeps at 440 Hz for 500 ms, pauses, repeats.

Prevention

tone() uses Timer2 on AVR, conflicting with analogWrite() on pins 3 and 11. Use a duration parameter to auto-stop the tone. Call noTone() to stop manually. Only one tone() can play at a time. tone() does not need pinMode — it sets the pin mode automatically.

DodaTech engineers apply these same patterns across Doda Browser, DodaZIP, and Durga Antivirus Pro for production IoT reliability.

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