This project depicts an obstacle-evasion robot vehicle restricted by an ultrasonic sensor. The Arduino microcontroller drives the robot prototype car, which employs an ultrasonic sensor for obstacle detection. This sensor is mounted on the vehicle’s front and two sides. The sensor receives data from the robot’s attached sensors once the encircling zone begins. The sensor detects the impediment and proceeds to choose an impediment-free path. The sensor will convey the command to the controller and is distinguished from the controller by selecting the appropriate motion for the robot wheel. The vehicle wheel’s advancement and direction will now be determined by the identification of the ultrasonic sensor and the use of a wheel encoder. This vehicle is used to detect obstructions and avoid their effects.