Design and Development of a Web-Monitored Integrated Electricity KWh Meter Using an IoT-Based Microcontroller

Khoirul Ahmat Efendi (Politeknik Piksi Ganesha Indonesia)
Asni Tafrikhatin (Politeknik Piksi Ganesha Indonesia)
Jati Sumarah (Politeknik Piksi Ganesha Indonesia)
Juri Benedi (Politeknik Piksi Ganesha Indonesia)
El Vionna Laellyn Nurul Fatich (Politeknik Piksi Ganesha Indonesia)
Tegar Prasetyo (Politeknik Negeri Sriwijaya)

Jurnal E-Komtek
Vol 10 No 1 (2026)

This study aims to develop an Internet of Things (IoT)-based electrical energy (kWh) monitoring system using an ESP32 microcontroller integrated with a web monitoring platform. The system employs ACS712 current and ZMPT101B voltage sensors to measure voltage, current, power, and electrical energy in real time. The research method used is Research and Development (R&D) with the 4D model, consisting of define, design, development, and dissemination stages. The test results indicate that the ZMPT101B sensor has an error rate of 0.49%–0.81%, while the ACS712 sensor has an error rate of 4.0%–14.2%. Measurement data were successfully transmitted and displayed on the monitoring website through an internet connection. The developed system is capable of providing real-time electrical energy monitoring with adequate accuracy and easy accessibility for users.