Ard Tone Multi

In this tutorial, you'll learn about Arduino tone() Conflict on Multiple Pins. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

The Problem

Trying to play different tones on multiple pins simultaneously fails.

Quick Fix

Wrong

tone(9, 440);
tone(10, 880);  // Second tone fails silently

Only pin 9 produces sound. Pin 10 is silent.

Right

// Play notes sequentially on one pin
int buzzer = 9;
int melody[] = {262, 294, 330, 349};  // C D E F
int noteDurations[] = {200, 200, 200, 200};

void setup() {
  for (int i = 0; i < 4; i++) {
    tone(buzzer, melody[i], noteDurations[i]);
    delay(noteDurations[i] + 50);
  }
}

Plays C-D-E-F sequentially on the buzzer.

Prevention

tone() uses one timer and can only output one frequency across all pins. For multi-note audio, play notes sequentially or use an external sound module (DFPlayer, MIDI shield). For simultaneous tones, use multiple boards or external tone generators.

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

FAQ