This is a design project of an air-filter sensor to be used in home heating and cooling system. The project includes conceptual design, analysis, implementation, tests and modifications. First, the air quality and power consumption between a clean air filter and a dirty air filter is studied. Then, a photo sensor circuit with an ultra high brightn

ess LED emitter and a phototransistor receiver is used to detect dust particles. A red warning LED lights up when a specified amount of dust is collected on the filter and blocks the light beam between the emitter and the receiver. The emitter and receiver are mounted on a simple fixture and can be easily fitted on any air filter. In addition, the cost analysis shows that this design can significantly reduce the electricity bill if the filters are properly replaced. A vital part of Engineering Technology (ET) education is the implementation of senior project designs to provide students with the opportunity to apply knowledge gained in other courses to solve practical problems. Engineering Technology students at usually take such a course in their senior year. Small groups of students (usually two) work on projects identified from one of several sources. The primary source of projects is local industry, usually small businesses. Many of these companies do not have the engineering staff to investigate new products or make major improvement in their manufacturing processes. Contacts with these companies may be initiated by faculty members, the companies themselves, the College`s Technology Application Center (an on-campus organization that specializes in promoting economic development for the region through matching industry needs with faculty expertise, student resources and university facilities), or by students who may be...

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