This white paper describes how light-powered smart weigh bins can automate stock control for small components such as screws, nuts, bolts, and washers. It explains why manual stock taking and dual-bin systems are limited, especially on construction sites or remote stores where there may be no dedicated store manager. The paper presents field trials with Codegate’s G1 Unmanned Store, where Lightricity-powered LuxBase weigh bins used ambient light and BLE communication to report real-time inventory levels without batteries, mains wiring, or manual stock reporting.