Low-cost Arduino-based Automated Weight Sorting System Using Load Cell Integration

Abstract

This study presents the design and implementation of a cost-effective Arduino-based automated weight sorting system for classifying small objects across multiple categories. The system operates in the 50-350 g range using a 5 kg load cell coupled with an HX711 24-bit ADC, achieving a measurement resolution of ±1.5 g. A servo-driven diverter mechanism, consisting of MG995 and SG90 actuators, is integrated with a DC gear motor-powered conveyor belt to perform real-time sorting. An ATmega328P-based Arduino nano microcontroller governs weight acquisition, threshold-based decision making, gate actuation, and data logging. User interaction is facilitated through a 16×2 I²C LCD and push-button interface, enabling live monitoring and configuration of sorting parameters without external software. The prototype is assembled on a compact plywood frame with vibration isolation and electrical safety features to ensure stable operation. The experimental results demonstrated a classification accuracy of 80%, continuous performance for up to 8 hours, and a maximum throughput of 25 items per minute. Owing to its modular architecture and replicable design, the proposed system shows strong potential for small-scale industrial automation, laboratory research, and academic applications.