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Target detection with ultrasonic sensor

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by

Abdullah Özkul

on 10 June 2014

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Transcript of Target detection with ultrasonic sensor

Objective
The objective of this project is to design a system using ultrasonic sensor that capable of detecting objects in its range. Then drawing these objects on computer in realtime.
Target detection
Target detection has a important part on todays world of technology. Military, security and home technologies, use systems that detect objects in their range and functions according to changes.
Radars is the most common target detection system.
Radar
RADAR is basically a means of gathering information about distant objects by transmitting electromagnetic waves at them and analyzing the echoes. The term Radar was coined in 1941 as an acronym for radio detection and ranging.
Our system is basicly a radar which transmite sound waves and analyzing the echoes.
Parts of the project
1- Arduino

2- Ultrasonic sensor

3- Servomotor

4- Processing program
Arduino
Arduino is a tool for making computers that can sense and control more of the physical world than your desktop computer. It's an open-source physical computing platform based on a simple microcontroller board, and a development environment for writing software for the board.
Ultrasonic sensor
Ultrasonic sensors generate high frequency sound waves and evaluate the echo which is received back by the sensor. Sensors calculate the time interval between sending the signal and receiving the echo to determine the distance to an object.
Target Detection with Ultrasonic Sensor

Kıvanç İliş
Abdullah Mesud Özkul

Project Advisor: Yalçın Çekiç
Servo motor
A servomotor is a rotary actuator that allows for precise control of angular position, velocity and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also requires a relatively sophisticated controller, often a dedicated module designed specifically for use with servomotors.
How does our system works ?
Our Arduino does two jobs in this project.
Firstly it controls the servomotor which decides the angle of ultrasonic sensor.
Secondly it collects datas from ultrasonic sensor and transfer them to the computer via data cable.
Application
This project has many practical applications in security and alarm based systems for
* Homes
* Shops
* Object detection
References
* http://www.grook.net/
* http://www.arduino.cc/
* http://users.ece.utexas.edu/~valvano/Datasheets/HCSR04b.pdf
* http://www.ece.iit.edu/~eoruklu/IIT/Publications_files/05229191.pdf
Processing Program
Processing is an open source programming language. Purpose of the program is teaching the fundamentals of computer programing in a visual context for electronic arts and visual design communities. After the creation of the program, Proccesing become a development tool for professionals. Students, artists, designers, researchers, and hobbyists started to use Processing for learning prototyping and production. It is free to download program
How does our system works ?
We supply a 10uS pulse to the trigger input to start, then sensor will send out 8 cycle burst of 40khz ultrasound. Then sound will reflect from the object, which is called echo. The time interval between trigger signal and echo signal gives us the datas to calculate the distance. Formula is
distance = time * velocity of sound (340m/s) / 2;
in uS and centimeters we can use distance = time /58.8
How does our system works ?
Our proccesing program collects servo angle and distance datas from arduino. Then draws the real time locations of the materials which is in range of the sensor.
Circuit scheme
Example
Full transcript