June 24, 2017
June 24, 2017
June 28, 2017
An instructional module was developed to help two-year college students learn about programmable logic control (PLC) programming. The objectives were to (1) develop a smart PLC controller to dynamically adjust traffic light duration based on traffic density within an intersection, and (2) evaluate students’ opinions and learning. The system consists of proximity sensors, a Click PLC, power supply, and two sets of green-yellow-red lights. The I/O devices were synchronized using a ladder logic program. Proximity sensors were used as inputs to provide information about traffic conditions within the intersection. The PLC adjusts the timing of the traffic light and remedies traffic congestion by changing the traffic light cycle as soon as traffic in the intersection gets heavy (based on inputs from the proximity sensors). The ladder logic consists of multiple sub-programs. Each sub-program controls traffic lights with different durations for each light. The proximity sensor status is used to determine which sub-program gets activated. Students have demonstrated how strong interest in the subject and find it very relevant to their daily lives.
Piña, J. A., & Hsieh, S. (2017, June), Board # 146 : MAKER: Instructional Module on Use of a Programmable Logic Controller for Smart Traffic Light Control Paper presented at 2017 ASEE Annual Conference & Exposition, Columbus, Ohio. https://peer.asee.org/27765
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