Cattle trading in rural areas often relies on visual estimation by intermediaries, known as "belantik", which may lead to uncertainty and inaccuracies in weight assessment. This study aims to design and evaluate the effectiveness of a digital cattle weighing prototype integrated with the HC-05 Bluetooth module. The system development includes hardware and software components. The hardware comprises an Arduino Mega 2560 and a load cell sensor for weight measurement. The software is an Android application displaying cattle weight, estimated price, and seller legality. Testing was conducted on three main aspects: the accuracy of the load cell sensor, the reliability of Bluetooth data transmission, and the functionality of the Android application. Results indicate that the load cell sensor has high accuracy, with an average error rate of only 0.07% compared to commercial digital scales across 15 trials. Data transmission using Bluetooth achieved a 100% success rate. The Android application also successfully displayed data in real-time. This prototype offers a promising solution to enhance transparency and fairness in cattle trading transactions.

Arduino Mega 2560, Bluetooth HC-05, Digital Weighing Scale, Legality of Buying and Selling

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