Ads by ArduinoGetStarted.com
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 |
Please note: These are affiliate links. If you buy the components through these links, We may 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 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
We are considering to make the video tutorials. If you think the video tutorials are essential, please subscribe to our YouTube channel to give us motivation for making the videos.
Keypad and Piezo Buzzer on Commercial Products
The Best Arduino Starter Kit
Follow Us
