Keypad Module

Project Overview

The Keypad Module project demonstrates how to interface a 4x4 matrix keypad with an Arduino Nano. The keypad consists of 16 buttons arranged in a 4x4 grid. This project reads the button pressed on the keypad and prints the corresponding character to the serial monitor.

Components Needed

1. Arduino Nano
2. 4x4 Matrix Keypad
3. Jumper Wires

Block Diagram

Circuit Setup

1. Connect Keypad to Arduino Nano:
   • Connect the row pins of the keypad to the Arduino Nano pins as follows:
     • ROW0 to pin 9
     • ROW1 to pin 8
     • ROW2 to pin 7
     • ROW3 to pin 6
   • Connect the column pins of the keypad to the Arduino Nano pins as follows:
     • COL0 to pin 5
     • COL1 to pin 4
     • COL2 to pin 3
     • COL3 to pin 2

Instructions

1. Circuit Setup:

   • Wire the 4x4 matrix keypad to the Arduino Nano as described in the circuit setup section.

2. Code Upload:

   • Connect the Arduino Nano to your computer via USB.
   • Open the Arduino IDE and paste the provided code.
   • Upload the code to the Arduino Nano.

3. Testing:

   • Once the code is uploaded, open the serial monitor.
   • Press buttons on the keypad and observe the corresponding characters printed on the serial monitor.

Applications

• Password Entry: Use the keypad for secure password entry in access control systems.
• Menu Navigation: Implement the keypad for navigating menus in various projects.
• User Input: Capture user input in projects requiring numerical or alphanumeric entry.

Notes

• Ensure proper connections to avoid incorrect readings.
• The Keypad library simplifies the process of interfacing with the keypad, handling the reading of button presses and debouncing.

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