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A Microprocessor Based Control System Project For An Integrated Freshman Curriculum

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Conference

2009 Annual Conference & Exposition

Location

Austin, Texas

Publication Date

June 14, 2009

Start Date

June 14, 2009

End Date

June 17, 2009

ISSN

2153-5965

Conference Session

Embedded Computing

Tagged Division

Computers in Education

Page Count

17

Page Numbers

14.56.1 - 14.56.17

Permanent URL

https://peer.asee.org/5300

Download Count

41

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Paper Authors

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Michael Swanbom Louisiana Tech University

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Davis Harbour Louisiana Tech University

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Hisham Hegab Louisiana Tech University

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Danny Eddy Louisiana Tech University

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Abstract
NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

Microprocessor-Based Control System Project for Integrated Freshman Curriculum

Abstract

A project has been developed and implemented in which the temperature and salinity are controlled in a small volume of water which is circulated using a small pump. A conductivity sensor measures salinity, and a Resistance Temperature Device (RTD) monitors temperature, providing data to a BASIC Stamp controller. Two relays are used to operate solenoid valves that release either fresh or salty water into the system, and a third relay is used to activate a heating element used to control temperature. A cascaded switching arrangement utilizing transistors allows the BASIC Stamp to drive these high-current devices. A DC motor-driven pump continuously circulates water through a fluid loop into which the conductivity sensor is integrated. Students fabricate an inline conductivity sensor (using a 555 timer), the RTD (using photolithography), a heating element (using a high-wattage resistor) and a wooden platform to which all of the components are mounted. The students develop programs to accomplish closed- loop control of the system, as well as provide a user interface where key system parameters are displayed. As part of our integrated freshman curriculum, this project provides hands-on experience to accompany traditional approaches to teaching science and engineering fundamentals including conservation of mass and energy, basic salt-water chemistry and electric circuitry. Assessment of the skills imparted through this project is provided using before and after survey data measuring student confidence in designing, fabricating and testing a working electro-mechanically controlled system.

Swanbom, M., & Harbour, D., & Hegab, H., & Eddy, D. (2009, June), A Microprocessor Based Control System Project For An Integrated Freshman Curriculum Paper presented at 2009 Annual Conference & Exposition, Austin, Texas. https://peer.asee.org/5300

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