CIPAD 40. Comment gérer plusieurs mots de passe, protéger 9 casiers et 9 clients. Arduino C++

Introduction

This tutorial guides you through setting up a secure system to manage multiple passwords for nine lockers using Arduino and C++. Each locker is protected by a unique Personal Identification Number (PIN), along with a master PIN for overall access. This project is ideal for beginners looking to enhance their programming skills while creating a practical security solution.

Step 1: Gather Your Components

Before starting, ensure you have the following components:

• Arduino board (e.g., Arduino Uno)
• 4x4 keypad
• LCD display (I2C preferred)
• 9 lock mechanisms (can be electronic locks or servos)
• Jumper wires
• Breadboard
• Power supply (if needed)

Practical Advice

• Verify compatibility of components with your Arduino model.
• Consider using a solderless breadboard for easy connections.

Step 2: Set Up the Hardware

1. Connect the Keypad:

   • Connect the rows and columns of the 4x4 keypad to the Arduino pins.
   • Use the following common connections:
     • Row pins to Arduino digital pins 2-5.
     • Column pins to Arduino digital pins 6-9.

2. Connect the LCD Display:

   • Use I2C interface for easier wiring.
   • Connect the SDA and SCL pins from the LCD to the Arduino (typically A4 and A5 for Uno).

3. Connect the Lock Mechanisms:

   • Connect each lock mechanism to a separate digital pin on the Arduino.
   • Ensure the power supply matches the requirements of your locks.

Practical Advice

• Double-check all connections to avoid short circuits.
• Use color-coded wires for easier identification.

Step 3: Install Required Libraries

To communicate with the keypad and LCD, you'll need to install specific libraries in your Arduino IDE:

• Keypad library
• LiquidCrystal_I2C library

Installation Steps

1. Open the Arduino IDE.
2. Go to Sketch > Include Library > Manage Libraries.
3. Search for "Keypad" and "LiquidCrystal I2C" and install them.

Step 4: Write the Arduino Code

Create a new sketch and include the necessary libraries. Here's a basic structure to get started:

#include <Keypad.h>
#include <LiquidCrystal_I2C.h>

const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {2, 3, 4, 5};
byte colPins[COLS] = {6, 7, 8, 9};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Define your PINs and logic for the lockers here

void setup() {
  lcd.begin();
  lcd.backlight();
  // Initialize other components
}

void loop() {
  // Logic for handling input and unlocking lockers
}

Practical Advice

• Make sure to define the PINs for each locker and include logic for the master PIN.
• Comment your code for clarity.

Step 5: Implement Locking Logic

1. Define PINs for Each Locker:

   • Create an array to store the PINs for each of the nine lockers and the master PIN.

2. Handle User Input:

   • Use loops to read input from the keypad and compare it against stored PINs.
   • Display messages on the LCD to indicate success or failure.

3. Control Lock Mechanisms:

   • Use digitalWrite to activate or deactivate the lock mechanisms based on the correct PIN input.

Example Code Snippet

String lockerPins[9] = {"1234", "2345", "3456", "4567", "5678", "6789", "7890", "8901", "9012"};
String masterPin = "0000";
// Add logic for checking PINs and unlocking

Conclusion

In this tutorial, you learned how to set up a secure locker system using Arduino, where each locker is protected by a unique PIN and a master PIN. This project not only enhances your programming skills but also provides a practical application for security management.

Next Steps

• Experiment with adding features, such as changing PINs or logging access attempts.
• Consider integrating a real-time clock (RTC) module for timestamped access logs.
• Explore advanced security measures, like biometric authentication.