How to make a Keypad based Door unlocking System
Here's a step-by-step guide to creating a keypad-based door unlocking system using an I2C LCD, a servo motor, and an Arduino
Description:
Unlocking doors using a keypad adds a layer of security to your home or office. In this project, we’ll use an Arduino, a 4x4 keypad, an I2C LCD, and a servo motor to create a keypad-based door unlocking system.
Components Needed:
- Arduino Uno
- 4x4 Keypad
- I2C LCD (16x2)
- Servo motor
- Breadboard and jumper wires
- Resistor (10k ohm)
- External power supply (optional)
Step 1: Connect the Components
1.1 Connect the Keypad:
- Connect the keypad to the Arduino digital pins.
- For example, connect R1, R2, R3, and R4 to pins 9, 8, 7, and 6.
- Connect C1, C2, C3, and C4 to pins 5, 4, 3, and 2.
1.2 Connect the I2C LCD:
- Connect the SDA pin of the I2C module to the A4 pin of the Arduino.
- Connect the SCL pin of the I2C module to the A5 pin of the Arduino.
- Connect the VCC and GND pins of the I2C module to the 5V and GND pins of the Arduino, respectively.
1.3 Connect the Servo Motor:
- Connect the signal pin of the servo to pin 10 on the Arduino.
- Connect the VCC and GND pins of the servo to the 5V and GND pins of the Arduino (or use an external power supply if necessary).
Step 2: Install Necessary Libraries
Before you start coding, ensure you have the necessary libraries installed:
- Keypad Library: To handle keypad input.
- LiquidCrystal_I2C Library: To manage the I2C LCD.
- Servo Library: To control the servo motor.
You can install these libraries via the Arduino IDE’s Library Manager.
Step 3: Write the Code
Step 4: Upload the Code and Test
1. Connect your Arduino to your computer using a USB cable.
2. Open the Arduino IDE, paste the code into a new sketch, and upload it to the Arduino board.
3. Once uploaded, the LCD will prompt you to enter the password.
4. Enter the password using the keypad. If correct, the servo will unlock the door by rotating 90 degrees and then return to the locked position after 5 seconds. If incorrect, the LCD will display "Access Denied."
Step 5: Finalize the Hardware Setup
1. Mount the servo motor on the door lock mechanism.
2. Secure the Arduino, keypad, and LCD in a suitable enclosure.
3. Ensure all connections are stable and protected from external damage.
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Conclusion :
Congratulations! You've successfully built a keypad-based door unlocking system using an I2C LCD, a servo motor, and an Arduino. This project not only enhances security but also provides a practical introduction to using various components together. For more projects and skills in embedded systems, check out Skill-Hub by EmbeddedBrew. Happy coding!