SMART CHARGING STATION (PCB + IoT) WITH LOAD BALANCING & PREPAID BILLING

Abstract: The rapid growth of electric and electronic devices has increased the demand for efficient, safe, and intelligent charging solutions. Conventional wired charging systems suffer from limitations such as cable degradation, energy losses, and lack of user authentication, leading to inefficient power utilization. To overcome these challenges, this paper presents the design and implementation of a Smart Wireless Charging Station integrated with RFID-based prepaid billing, load balancing, and IoT-enabled monitoring.

The proposed system utilizes an Arduino Uno as the main controller and a NodeMCU module for real-time data communication with cloud platforms. Wireless power transfer is achieved using inductive coupling between transmitter and receiver coils, enabling contactless energy transfer. An RFID module ensures secure user authentication and controlled access based on prepaid balance. Additionally, an IR sensor detects device presence to prevent idle power consumption, while a voltage sensor continuously monitors system conditions to enable efficient load balancing and protection.

The system also incorporates IoT technology to provide real-time monitoring of parameters such as voltage levels, charging duration, and user activity through platforms like ThingSpeak. Experimental results demonstrate reliable authentication, efficient wireless power transfer, effective load management, and accurate data logging.

The proposed Smart Charging Station offers enhanced safety, improved energy efficiency, and user convenience, making it a suitable solution for applications in smart cities, public charging stations, and IoT-based energy management systems.

Keywords: RFID, Arduino uno Microcontroller, LCD Display, PCB, Node MCU, Wireless charging station, power transmission coils.