Vol. 95, Issue 8, August 2008, pp.49-57

Ultrasonic Obstruction Detection & Distance Measurement Using AVR Microcontroller

Satish Pandey, Dharmendra Mishra, Anchal Srivastava, Atul Srivastava, R. K. Shukla

 Department of Physics, University of Lucknow, Lucknow- India

E-mail: sat_shy@rediffmail.com

Received: 16 June 2008   /Accepted: 15 August 2008   /Published: 25 August 2008

Abstract: This paper describes the practical implementation of a short range ultrasonic obstruction detection and distance measurement device. By employing an ultrasonic transducer pair for producing ultrasonic sounds and sensing the reflected sound waves, the obstructions are detected. The hardware interface uses an Atmel ATmega8 AVR microcontroller to facilitate the generation of 40 kHz signal burst which is used in the transmitter circuit, and also to process the received signal for measuring the time of flight of reflected waves and exact distance of the obstruction. The program for this device is developed in WinAVR, and the code generated is dumped into microcontroller using AVR Studio. Educational aspects of this project include the mastery of a programming language and corresponding tools, the design of a functional and intuitive embedded application, and the development of appropriate hardware to build the device.

Keywords: Ultrasonic Transducers, Obstruction Detection, Distance Measurement, AVR Microcontroller, Signal Conditioning

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