Obstacle-Avoiding Autonomous Car Robot Using Arduino

The Obstacle-Avoiding Autonomous Car Robot operates as an integrated closed-loop mobile system centered around the Arduino Uno R3. The structural foundation consists of an acrylic sheet chassis housing four DC gear motors connected to wheels, providing differential drive mobility. Power is supplied independently by a LiPo battery, which feeds both the Arduino and the motor driver shield. The motor driver shield acts as an intermediary, translating low-voltage digital control signals from the Arduino Uno into the higher current and voltage required to drive the four DC gear motors forward, backward, or in turning patterns. To enable navigation, an ultrasonic sensor is mounted onto a sensor stand, often mechanically panned by a servo motor. The ultrasonic sensor emits high-frequency sound waves and measures the time it takes for the echo to return, translating this time into distance data. This data is processed in real-time by an Arduino programming language sketch running on the microcontroller. When the ultrasonic sensor detects an obstacle within a predefined distance threshold, the Arduino executes programmed conditional logic. It halts the DC gear motors, commands the servo motor to sweep the ultrasonic sensor left and right to scan alternate paths, evaluates the spatial clearances, and directs the motor driver shield to steer the robot away from the detected hazard, continuing autonomous navigation without human intervention.