Payment systems play an important role in today's society. Without them, it would render common systems such as vending machines and parking meters useless. I wanted to take an approach that would identify currencies using their size. Download the report here.
The Coin Reader is a device that identifies the value of coins through measuring its diameter.
This project utilized an HC-SR04 ultrasonic sensor used in conjunction with a mechanical mechanism measures the displacement of the reference object when an inserted coin pushes against the mechanism. A coin is identified if the distance displaced is equal to the diameter of the inserted coin.
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S. (2020, July 28). Arduino Coin Sorter and Counter. The Engineering Minds. https://www.theengineeringminds.com/arduino-coin-sorter-and-counter/
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D. (2021, February 5). Ultrasonic Sensor HC-SR04 and Arduino Tutorial. HowToMechatronics. https://howtomechatronics.com/tutorials/arduino/ultrasonic-sensorhc-sr04/
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Dubey, A. (2020, August 22). How to improve readings of Ultrasonic Sensor - Temperature and Humidity Compensation. NerdyElectronics. https://nerdyelectronics.com/embedded-systems/sensorshow-to-improve-readingsof-ultrasonic-sensor-temperature-and-humiditycompensation/
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Fmalpartida. (2020, November 24). New-LiquidCrystal. GitHub Repository, https://github.com/fmalpartida/NewLiquidCrystal