Arduino Nano - Keypad - Beep
This tutorial instructs you how to use Arduino Nano to generate a beep when the keypad is pressed. In detail, Arduino Nano controls the piezo buzzer to emit a short sound for each key press.
Hardware Preparation
| 1 | × | Arduino Nano | |
| 1 | × | USB A to Mini-B USB cable | |
| 1 | × | Keypad | |
| 1 | × | Piezo Buzzer | |
| 1 | × | Breadboard | |
| 1 | × | Jumper Wires | |
| 1 | × | (Optional) 9V Power Adapter for Arduino Nano | |
| 1 | × | (Recommended) Screw Terminal Adapter for Arduino Nano |
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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Overview of Keypad and Piezo Buzzer
If you are unfamiliar with keypad and Piezo Buzzer (pinout, how it works, how to program ...), the following tutorials can provide guidance:
The ezBuzzer library is created to enable buzzers to beep or play a tune without interfering with other code.
Wiring Diagram
This image is created using Fritzing. Click to enlarge image
Arduino Nano Code
/*
* This Arduino Nano code was developed by newbiely.com
*
* This Arduino Nano code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano/arduino-nano-keypad-beep
*/
#include <Keypad.h>
#include <ezBuzzer.h>
const int BUZZER_PIN = 2;
const int ROW_NUM = 4; // four rows
const int COLUMN_NUM = 3; // three columns
const byte pin_rows[ROW_NUM] = {9, 8, 7, 6}; // The Arduino Nano pin connected to the row pins of the keypad
const byte pin_column[COLUMN_NUM] = {5, 4, 3}; // The Arduino Nano pin connected to the column pins of the keypad
char key_layout[ROW_NUM][COLUMN_NUM] = {
{'1', '2', '3'},
{'4', '5', '6'},
{'7', '8', '9'},
{'*', '0', '#'}
};
Keypad keypad = Keypad( makeKeymap(key_layout), 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
}
}
Detailed Instructions
- Connect a USB cable between the Arduino Nano and the PC.
- Open the Arduino IDE, choose the correct board and port.
- Click to the Libraries icon on the left bar of the Arduino IDE.
- Search for “keypad” and locate the keypad library created by Mark Stanley and Alexander Brevig.
- Click the Install button to complete the installation of the keypad library.
- Search for “ezBuzzer” and locate the buzzer library by ArduinoGetStarted.
- Then, press the Install button to install the ezBuzzer library.
- Copy the code and open it in the Arduino IDE.
- Click the Upload button in the Arduino IDE to send the code to the Arduino Nano.
- Press certain keys on the keypad.
- Listen for the beep and observe the output in the Serial Monitor.
Code Explanation
Check out the line-by-line explanation contained in the comments of the source code!