Arduino - Keypad - Beep

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 3x4 and 4x4 Kit
1	×	Piezo Buzzer
1	×	Breadboard
1	×	Jumper Wires
1	×	(Optional) 9V Power Adapter for Arduino
1	×	(Recommended) Screw Terminal Block Shield for Arduino Uno

Or you can buy the following sensor kit:

DIYables Sensor Kit 30 types, 69 units

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About Keypad and Piezo Buzzer

If you do not know about keypad and Piezo 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.

Please note that this tutorial use 3-5V buzzer, but you can adapt it for 12v buzzer. you can learn about Arduino - Buzzer tutorial

Wiring Diagram

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Arduino Code

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-keypad-beep */ #include <Keypad.h> #include <ezBuzzer.h> const int BUZZER_PIN = 11; const int ROW_NUM = 4; // four rows const int COLUMN_NUM = 4; // four columns char keys[ROW_NUM][COLUMN_NUM] = { {'1', '2', '3', 'A'}, {'4', '5', '6', 'B'}, {'7', '8', '9', 'C'}, {'*', '0', '#', 'D'} }; 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, 2}; // 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(100); // generates a 100ms beep } }

Quick Steps

Connect Arduino to PC via USB cable
Open Arduino IDE, select the right board and port
On Arduino IDE, Go to Tools Manage Libraries

Search “keypad”, then find the keypad library by Mark Stanley, Alexander Brevig
Click Install button to install keypad library.

Search “ezBuzzer”, then find the buzzer library by ArduinoGetStarted
Click Install button to install ezBuzzer library.

Copy the above code and open with Arduino IDE
Click Upload button on Arduino IDE to upload code to Arduino

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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