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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
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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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
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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-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.
- 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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