Arduino uno Keypad

This project demonstrates how to interface a 4x3 matrix keypad with an Arduino.

The keypad allows for input of numeric and special characters, which are then displayed on the Serial Monitor.

This setup can be used in a variety of applications such as password entry systems, user input interfaces, and other interactive projects requiring keypad input.

Components Needed

Block Diagram

Hardware Wiring Explanation:

1.Keypad to Arduino:

Connect the row pins of the keypad to digital pins 6, 7, 8, and 9 on the Arduino.

Connect the column pins of the keypad to digital pins 3, 4, and 5 on the Arduino.

Power the Arduino

Connect the Arduino to your computer using a USB cable.

Software (Arduino IDE):

Open the Arduino IDE on your computer.

Write or paste the provided program into the IDE.

Select the correct board and port in the Arduino IDE under the Tools menu.

Upload the program to the Arduino.

Monitor the Output:

Open the Serial Monitor in the Arduino IDE by selecting Tools

Set the baud rate to 9600 in the Serial Monitor.

Press keys on the keypad and observe the corresponding characters being printed on the Serial Monitor.

Project Operation

Initialization:

The Arduino initializes serial communication at 9600 baud.

Reading Keypad Input:

The program continuously checks for key presses on the keypad.

When a key is pressed, the character is read and printed to the Serial Monitor.

The layout of the keypad is defined by a 2D array representing the characters associated with each key.

The

Code Breakdown:

1.Keypad Setup:

The

The

2.Loop Function:

The

When a key is pressed, its value is printed to the Serial Monitor.

Applications