Abstract
Smart switch with manual override capability provides a fallback mechanism for users to control household appliances in the event of electronics failure. Essentially, the device is equipped with a single-pole double-throw (SPDT) mechanical switch coupled with electronically-controlled relay. Load current is measured through current sensor connected to the return lines and is constantly read by microcontroller to determine the operational state of the switch and to detect over-current fault. A hardware prototype was developed that uses open-source software to ease system development. Lab testing verifies functional operation of the prototype meets design objectives.
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