Title: Design and Implementation of a Secure Wemos D1 Mini-Based Smartphone Charger Monitoring System with Cybersecurity Measures
Authors: Samuel Uzodinma Muoleeh
Volume: 9
Issue: 12
Pages: 78-82
Publication Date: 2025/12/28
Abstract:
The increasing reliance on portable electronic devices and renewable energy solutions has intensified the demand for charging systems that are efficient, secure, and intelligently monitored. This paper presents the design and implementation of a secure smartphone charger monitoring system based on the Wemos D1 Mini, integrating Internet of Things (IoT) functionality with lightweight cybersecurity measures. Voltage and current sensors were employed to monitor charging parameters, with real-time values displayed on an LCD and transmitted to a Firebase cloud database for remote access. To ensure data confidentiality and integrity, AES-128 encryption and token-based authentication were implemented, preventing unauthorized access to transmitted and stored data. Experimental evaluation of the prototype demonstrated reliable performance, with voltage and current measurement errors of ±1.5% and ±2.2%, respectively, when compared with a commercial multimeter. Relay switching tests yielded an average response time of 150 ms, while Wi-Fi communication achieved an average latency of 280 ms, supporting near real-time operation. The results demonstrate that integrating lightweight cybersecurity techniques with cloud-based services significantly enhances the safety, reliability, and data protection of low-cost IoT-based smart charger monitoring systems suitable for residential and educational applications.