Development of IoT Smart Voltmeter for Real Time Voltage Monitoring

A voltmeter capable of accurately measuring and providing remote monitoring for both AC and DC voltage is crucial in modern application, especially with the growing demand for IoT based devices. Real-time voltage measurement poses challenges, particularly in ensuring reliability and efficiency. This paper addressed these challenges by designing and constructing a wireless voltmeter incorporating an ESP32 microcontroller for wireless communication, a 7805-voltage regulator for stable power supply and PCB17 opto-coupler for electrical isolation and safety. The circuit design was simulated using Proteus software to verify its functionality and performance prior to physical implementation. The completed system successfully measured AC voltages in the range 2-250V and DC voltages between 3 -25V, achieving a minimal error margin after calibration. Voltage readings were wirelessly transmitted to the Blynk IoT platform, enabling seamless real-time monitoring via a mobile application. The system’s accuracy and reliability were validated through extensive testing, demonstrating its effectiveness as practical solution for modern voltage measurement.