By the use of ultra sonic sensor sends high-frequency sound waves go out. When a fall or obstacles. High-frequency sound waves are reflected back to the receiver.
The work will be used in ultra sonic sensor sends out high-frequency sound waves. When it hits an object or obstacle. High frequency sound waves are reflected back to the receiver.
The work uses ultrasonic sensors send high frequency sound wave. When the impact with objects or obstructions. High frequency sound wave will be reflected back to the receiver.