Build a simple digital keyboard that plays real notes using Arduino

This project creates a simple digital keyboard that uses push buttons to play musical notes through a piezo buzzer with Arduino. It is also an educational project demonstrating analog input reading and sound generation with Arduino.

Aug 20, 2025

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26732 views

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MIT

Arduino User Group

Audio

Music

Devices & Components

Arduino Starter Kit [English]

USB 2.0 Cable Type A/B

Arduino Uno Rev3

Resistor 10k ohm

Breadboard Jumper Wire Pack (200mm&100mm)

Push Button

Resistor 1 M ohm

Mini breadboard - White

Resistor 330 ohm

Piezo Buzzer

Hardware & Tools

Laptop

Software & Tools

Fritzing

Arduino IDE

Project description

Code

Code for Digital Keyboard with Sound Output

cpp

Use this code in Arduino IDE.

1int notes[] = {262, 294, 330, 349};
2
3void setup() {
4  Serial.begin(9600);
5}
6
7void loop() {
8  int keyVal = analogRead(A0);
9  Serial.println(keyVal);
10
11  if (keyVal == 1023) {
12    tone(8, notes[0]);
13  } else if (keyVal >= 990 && keyVal <= 1010) {
14    tone(8, notes[1]);
15  } else if (keyVal >= 505 && keyVal <= 515) {
16    tone(8, notes[2]);
17  } else if (keyVal >= 5 && keyVal <= 10) {
18    tone(8, notes[3]);
19  } else {
20    noTone(8);
21  }
22}

int notes[] = {262, 294, 330, 349};

void setup() {
  Serial.begin(9600);
}

void loop() {
  int keyVal = analogRead(A0);
  Serial.println(keyVal);

  if (keyVal == 1023) {
    tone(8, notes[0]);
  } else if (keyVal >= 990 && keyVal <= 1010) {
    tone(8, notes[1]);
  } else if (keyVal >= 505 && keyVal <= 515) {
    tone(8, notes[2]);
  } else if (keyVal >= 5 && keyVal <= 10) {
    tone(8, notes[3]);
  } else {
    noTone(8);
  }
}

Downloadable files

Digital Keyboard with Sound Output using Arduino

Arduino Project - Rexhep Mustafovski .pdf

Documentation

Fritzing Circuit Diagram – Digital Keyboard with Arduino

Rexhep Mustafovski.png

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