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. In plastic injection molding machines, the plastic pellet filling process is generally done manually in a closed tank. The operator is facing some difficulties in measuring the level of plastic pellets in the storage tank, and as a result, it can slow down productivity. In this research, the prototype of the monitoring system was employed to measure the volume of plastic pellets in the storage tank using the HC-SR04 ultrasonic sensor ESP8266 data processing equipped with LCD and data communication media. After some measurement, the results show that the plastic pellet tank monitor system can satisfy the expectation. After data validation was carried out, it is found that the average accuracy of the ultrasonic sensor 1 is 97.2%, and the average accuracy of the ultrasonic sensor 2 is 95.3%. In the experiment, the ultrasonic sensor readings show the minimum level is 0 cm and the maximum level is 32.8 cm. Furthermore, it takes an average of 1.9 seconds from reaching the minimum limit until a notification appears on the Blynk application.

Design and Build A Plastic Pellet Monitor System Prototype on An Injection Molding Plastic Storage Tank with The Blynk Application