Autonomous Line-Following Robot Car

Technologies: AVR / ARM Microcontrollers · C Programming · Ultrasonic Sensors · Photoresistors · Bluetooth · LCD Display

Robot Car Top View
Key Hardware Features:
  • Photoresistor array for precise line detection
  • Ultrasonic sensor for obstacle distance measurement
  • Bluetooth module for remote control overrides
  • LCD screen for displaying sensor readings in real-time

Project Summary

This 10-week project involved developing a fully autonomous robot car using AVR and ARM microcontrollers. The system evolved through four progressive demonstrations, from basic serial communication to complex autonomous track navigation.

Demo 1: Hardware & Communication

Programmed AVR/ARM communication using USART2 (due to USART1 hardware issues) and integrated ultrasonic sensors and photoresistors.

Demo 2: Autonomous Line Tracking

Implemented a Switch-Case State Machine to handle a roundabout and zebra crossing. The car successfully completed 3 laps in 31 seconds.

Demo 3: Speed & Obstacle Avoidance

Combined line tracking with obstacle detection, achieving 5 tracks in just 6.97 seconds. Drifting was resolved by fine-tuning PWM bias ratios.

Download Full Report (PDF)

Live Demonstration Video

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