VoltGuard: AC Voltage Protection Card for Under and Overvoltage Conditions

VoltGuard is an intelligent voltage protection system designed to monitor and safeguard electrical appliances from hazardous under-voltage and over-voltage conditions in AC supply. This compact voltage protection card uses an Arduino microcontroller and voltage sensing circuit to constantly monitor the input voltage levels.

When the AC voltage drops below or exceeds preset safe thresholds, the system automatically disconnects the load using a relay, preventing potential damage to sensitive equipment. A 16x2 LCD displays real-time voltage readings and system status, while a buzzer provides audible alerts during fault conditions. LEDs indicate system mode (normal, undervolt, overvolt).

VoltGuard is suitable for homes, small industries, and labs where voltage stability is crucial. It ensures both equipment safety and power reliability, making it a practical solution for areas prone to voltage fluctuations.