Application of Ultrasonic Sensor and IR Sensor in Automatic Alcohol Hand Sanitizer von Jongchanachavawat, Wirote, Sungkongmueng, Bureerak, Inyasri, Chaleedol, Roopkom, Ittipat, Mingmuang, Noppon, Putthed, Pichamol, Srithammakan, Atiwat, Chinowan, Boonpi, Pathomphomma, Patcharapon, Kumngern, Peemongkol, Bunyarittikit, Suphat, Jongchanachavawat, Patchamon

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