Arduino - Keypad - Buzzer

In this tutorial, we will learn how to Arduino and piezo buzzer to generate a beep sound each time a key on keypad is pressed.

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×Keypad
1×Piezo Buzzer
1×Breadboard
1×Jumper Wires
1×(Optional) 9V Power Adapter for Arduino
1×(Recommended) Screw Terminal Block Shield for Arduino Uno
1×(Optional) Transparent Acrylic Enclosure For Arduino Uno

Or you can buy the following sensor kit:

1×DIYables Sensor Kit 30 types, 69 units
Please note: These are Amazon affiliate links. If you buy the components through these links, We will get a commission at no extra cost to you. We appreciate it.

About Keypad and Piezo Buzzer

If you do not know about keypad and Buzzer (pinout, how it works, how to program ...), learn about them in the following tutorials:

The ezBuzzer library is designed for buzzer to beep or play memody without blocking other code.

Wiring Diagram

Arduino keypad buzzer wiring diagram

This image is created using Fritzing. Click to enlarge image

Arduino Code

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-keypad-buzzer */ #include <Keypad.h> #include <ezBuzzer.h> #define BUZZER_PIN A0 #define ROW_NUM 4 // four rows #define COLUMN_NUM 3 // three columns char keys[ROW_NUM][COLUMN_NUM] = { {'1','2','3'}, {'4','5','6'}, {'7','8','9'}, {'*','0','#'} }; byte pin_rows[ROW_NUM] = {9, 8, 7, 6}; // connect to the row pinouts of the keypad byte pin_column[COLUMN_NUM] = {5, 4, 3}; // connect to the column pinouts of the keypad Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM ); ezBuzzer buzzer(BUZZER_PIN); // create ezBuzzer object that attach to a pin void setup() { Serial.begin(9600); } void loop() { buzzer.loop(); // MUST call the buzzer.loop() function in loop() char key = keypad.getKey(); if (key) { Serial.print(key); // prints key to serial monitor buzzer.beep(200); // generates a 200ms short sound } }

Quick Steps

  • Connect Arduino to PC via USB cable
  • Open Arduino IDE, select the right board and port
  • Navigate to the Libraries icon on the left bar of the Arduino IDE.
  • Search “keypad”, then find the keypad library by Mark Stanley, Alexander Brevig
  • Click Install button to install keypad library.
Arduino keypad library
  • Search “ezBuzzer”, then find the buzzer library by ArduinoGetStarted
  • Click Install button to install ezBuzzer library.
Arduino buzzer library
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
Arduino IDE Upload Code
  • Press some keys on keypad
  • Listen the beep and see the result in Serial Monitor

Code Explanation

Read the line-by-line explanation in comment lines of source code!

Video Tutorial

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