Whether you’re building a robotic arm, an automated door, or a pan-tilt camera system, servo motors are the go-to choice for accurate angular movement. With the help of this guide you can learn how to interface a servo motor with Arduino, make it work, and control its position with the help of provided code.
What is a Servo Motor?
A servo motor is a type of motor used in various applications to precisely control the position, speed, and angular rotation of mechanical systems.
It consists of:
DC Motor – The main driver
Gear System – Reduces speed, increases torque
Control Circuit – Receives signals & adjusts position
Feedback Mechanism – Ensures accurate movement
Unlike DC motors, servo motors rotate within a fixed range (0° to 180°) and hold their position when powered.
Components Required
For this project, you’ll need:
Arduino Uno
SG90 or MG995 Servo Motor
Jumper Wires
External Power Source (if using a high-torque servo)
Circuit Diagram of Interfacing Arduino with Servo Motors and Potentiometer
Applications of Servo Motors
Robotic Arms & Grippers
Automated Doors & Windows
RC Cars & Airplanes
Pan-Tilt Camera Systems
DIY Animatronics & Smart Toys
Servo motors are easy to use and extremely useful for precise motion control in Arduino projects. With just a few lines of code, you can make them rotate, hold positions, and automate movements in your projects.
The L298N Motor Driver Module is a high power motor driver module for driving DC and Stepper Motors.. It supports motors operating at 5V to 35V and offers features like:
This project explains how to interface the L298N Motor Driver Module with Arduino to control DC motors efficiently. The L298N allows you to regulate motor speed and direction using PWM signals, making it perfect for robotics, automation, and motorized projects. With this tutorial, you'll learn to drive motors forward, backward, and at variable speeds, enabling you to build remote-controlled cars, conveyor systems, and robotic arms.
Abidirectional countercounts objects or people moving in two directions, incrementing the count for one direction and decrementing for the opposite. It is commonly used in:
Automatic door entry systems
Visitor counters in malls, offices, and stations
Industrial conveyor belt monitoring
Components Required
To build this project, you'll need:
Arduino Uno
IR Sensors (2x)
7-Segment Display or LCD
Resistors & Capacitors
Jumper Wires & Breadboard
This project demonstrates how to use the L298N Motor Driver Module with Arduino to control the speed and direction of a DC motor. By leveraging PWM (Pulse Width Modulation) signals, you can achieve precise motion control, making it ideal for robotics, automation, and motorized systems. Whether you're a beginner or an advanced maker, this tutorial will help you understand motor control concepts and apply them to your own projects.
Learn how to build an RFID-based door lock system using an Arduino Uno, an RFID module, and a servo motor. The system scans an RFID card, checks its ID, and unlocks the door if it’s authorized. This setup is useful for home security, office access control, and smart automation projects.
Components Required
Arduino Uno (or compatible board)
RC522 RFID Module (to read RFID tags)
RFID Cards & Key Fobs (for authentication)
Servo Motor (to control the lock)
Buzzer & LED Indicators (for access feedback)
Jumper Wires & Breadboard (for connections)
Components Required to make RFID Door Lock System Using Arduino
RFID Door Lock System using Arduino Circuit Diagram
Circuit Diagram RFID Door Lock System using Arduino
The RFID door lock system works by scanning an RFID cardor key fob using the RC522 RFID module. When a card is scanned, the Arduino reads its unique ID and checks if it matches a pre-stored authorized ID. If the card is recognized, the servo motor unlocks the door, allowing access. If the card is not authorized, the system triggers a buzzer and an LED indicator to signal access denial. After a short delay, the lock resets and waits for the next scan, ensuring continuous operation.
This Arduino-based RFID door lock system reads an RFID card’s UID, checks it against a predefined UID, and unlocks the door for 10 seconds using a relay and solenoid lock while displaying the status on an LCD.
Step-by-Step Guide
Step 1: Setting Up the Hardware
Start by assembling the required components. Connect the RC522 RFID module to the Arduino Uno using SPI communication. Attach the relay module and solenoid lock for door control, and connect the LCD display to show access status. Ensure the power supply is stable for reliable operation.
Step 2: Uploading the UID Retrieval Code
To get the unique ID (UID) of your RFID card, compile and upload the UID retrieval code to the Arduino. This step doesn’t require any hardware modifications. Once uploaded, open the Serial Monitor in the Arduino IDE to view the scanned UID.
Step 3: Storing the Authorized UID
After retrieving the UID, update the main code by replacing the default UID with your card’s UID. This ensures that only the authorized card can unlock the door. Save and re-upload the modified code to the Arduino.
Step 4: Implementing the Door Lock System
The main program continuously scans for RFID cards. When a card is detected, the Arduino checks if its UID matches the stored UID. If authorized, the relay activates the solenoid lock, unlocking the door for 10 seconds. Meanwhile, the LCD display updates the door status.
Step 5: Testing and Final Adjustments
Test the system by scanning different RFID cards. If unauthorized, the lock remains closed, and the system displays an access denied message. Adjust the servo angles, delay timings, or security features as needed for better performance.
Final Testing of our RFID Door Lock System
Working Demo video :
Enhancements & Customization
Store multiple RFID card IDs for multi-user access.
Add an OLED display to show authentication messages.
Integrate Wi-Fi or Bluetooth for remote access control.
Connect to a database for logging entry records.
This RFID-based door lock system offers a simple yet effective way to manage access control. It can be expanded with additional features to enhance security and functionality.
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