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Arduino - Keypad - Beep
When a key on the keypad is pressed, the piezo buzzer beeps. Without delay() function for beeping, there is no keypad's press missed.
Hardware Required
| 1 | × | Arduino UNO or Genuino UNO | |
| 1 | × | USB 2.0 cable type A/B | |
| 1 | × | Keypad | |
| 1 | × | Piezo Buzzer | |
| 1 | × | Breadboard | |
| n | × | Jumper Wires |
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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.
Wiring Diagram
Image is developed 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-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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Keypad and Piezo Buzzer on Commercial Products
The Best Arduino Starter Kit
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