Design and Development of An Iot-Based Digital Scale for Measuring Cement Weight Using A Load Cell Sensor at Pt Semen Tonasa, Balikpapan Branch

Abstract

Manual cement weighing in the industrial environment of PT Semen Tonasa, Balikpapan Branch, is considered inefficient and prone to human error. This study aims to develop a prototype Internet of Things-based digital conveyor weighing system capable of automatically measuring, sorting, and monitoring the weight of cement packages. The system is controlled by an ESP32 microcontroller integrated with a load cell sensor and an HX711 amplifier module to read the dynamic weight of packages moving on the conveyor. The conveyor belt is driven by a DC motor with a BTS7960-series driver, while a servo motor serves as the sorting arm actuator. The system is programmed to recognize a target cement weight of 500 grams with a tolerance of 10 grams. Remote monitoring is performed through a local web server dashboard with a client–server architecture that displays indicators and weighing history charts without excessively burdening the microcontroller memory. Test results show that the system successfully identifies peak loads dynamically, allows on-target packages to proceed, and automatically removes nonconforming packages. The device demonstrates very high accuracy, with an average reading error of only 0.63%. The system exhibits substantially better precision and operational consistency than conventional weighing methods