🤖 AutoStrider — Line Following Robot

A smart, Arduino-based line-following robot with real-world prototype & online simulation
Built and tested by a team of students from Amrita Vishwa Vidyapeetham

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🌐 Simulation Link

🔗 Try it yourself:
AutoStrider — Tinkercad Simulation

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🧩 Overview

AutoStrider is an intelligent line-following robot capable of autonomously following a black track using IR sensors.
It’s powered by an Arduino UNO and uses an H-bridge motor driver for directional control.

The project was implemented both in simulation (Tinkercad) and as a physical prototype, validating real-world performance.

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⚙️ Features

• Dual IR sensor module for line detection
• Directional control using L293D driver
• PWM-based speed control for balanced movement
• Smooth line tracking logic (forward, left, right, stop)
• Simulation & real hardware prototype

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🧠 Working Principle

• Two IR sensors continuously scan the surface below.
• Black line reflects less IR light → sensor outputs LOW.
• Depending on sensor output:
  • Both LOW → move forward
  • Left LOW, Right HIGH → turn right
  • Right LOW, Left HIGH → turn left
  • Both HIGH → stop

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🧰 Components Used

Component	Quantity	Description
Arduino UNO	1	Main microcontroller
IR Sensor Module	2	Detects black line
L293D Motor Driver	1	Controls motor direction
DC Motors + Wheels	2	Motion mechanism
Robot Chassis	1	Base platform
Power Supply (9V/12V)	1	Motor + logic power
Connecting Wires	—	For circuit connections

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🔌 Circuit Connection

Arduino Pin	Connection	Description
D11	IR Sensor (Right)	Line detection
D12	IR Sensor (Left)	Line detection
D6	Enable Right Motor	PWM speed control
D7, D8	Right Motor Direction
D5	Enable Left Motor	PWM speed control
D9, D10	Left Motor Direction

🧭 Common Ground must be shared between Arduino and motor driver power.

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🧾 Code

Complete Arduino sketch available in code/Autostrider.ino

The program reads IR sensor values, decides direction, and drives motors using PWM signals.

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📸 Simulation & Prototype

Type	Screenshot
Tinkercad Simulation
Real-World Prototype

🎥 You can include a short GIF or video link here to showcase it following a line.

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🚀 How to Run

1. Open Autostrider.ino in Arduino IDE
2. Connect Arduino UNO via USB
3. Select the correct board & COM port
4. Upload the code
5. Open Serial Monitor (9600 baud) to observe sensor readings
6. Place robot on black line track and watch it follow autonomously!

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🔧 Calibration Tips

• Adjust MOTOR_SPEED_LEFT and MOTOR_SPEED_RIGHT for balanced speed.
• Keep sensors 0.5–1cm above the track.
• Use matte black electrical tape for better contrast.

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🎯 Future Enhancements

• Add PID control for smoother turns
• Integrate Bluetooth module for manual control
• Add ultrasonic sensor for obstacle avoidance
• Implement battery voltage monitoring

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📜 License

This project is licensed under the MIT License.

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