Sistem Monitoring Parameter Listrik AC Satu Fasa Berbasis Wemos D1 dan ThingSpeak

Abstract

This research develops a single-phase AC electrical parameter monitoring system based on the Wemos D1 microcontroller, PZEM-004T sensor, and ThingSpeak Internet of Things platform. The system monitors voltage, current, active power, electrical energy, frequency, and power factor, and transmits measurement data through Wi-Fi for real-time remote monitoring. The research uses an engineering and experimental approach consisting of hardware and software design, system integration, implementation, and testing under several household load conditions. Tests included a fan, refrigerator, and electric iron, with additional evaluation under low-load and high-load operating periods. The fan test produced approximately 213–218 V, 0.03–0.05 A, 4–6 W, and a power factor of 0.58–0.85. The refrigerator showed approximately 200–208 V with fluctuating current and power according to the compressor cycle and a power factor of 0.60–0.85. The electric iron produced 212–219 V, 0.2–1.5 A, 30–400 W, and a power factor of 0.98–1.00. Frequency remained within 49.9–50 Hz. Measurement data were successfully transmitted and displayed on ThingSpeak in real time. The results indicate that the system can continuously monitor different load characteristics and support remote household electrical monitoring. Accuracy was evaluated from consistency and load-response characteristics because laboratory-standard calibration was not performed.