MOBILE CHARGER USING COIN INSERTION

Abstract

Mobile phones have become one of the most important communication devices in modern society. People use mobile phones for communication, internet access, online banking, education, entertainment, emergency services, and many other daily activities. Due to continuous usage, mobile batteries discharge quickly and require frequent charging. In many public places such as railway stations, bus stands, airports, hospitals, shopping malls, colleges, and tourist locations, users often face difficulties in finding charging facilities during emergencies. To overcome this problem, the project titled “Mobile Charger Using Coin Insertion” is proposed.

The proposed system is an automated mobile charging station that allows users to charge their mobile phones by inserting coins into the machine. The system is designed using embedded system technology, microcontrollers, power supply units, relay circuits, coin acceptor modules, charging ports, timer circuits, and display units. The charging process begins when a user inserts a valid coin into the coin acceptor mechanism. The coin acceptor validates the coin and sends signals to the microcontroller. After successful validation, the controller activates the relay circuit and enables the charging ports for a predefined time duration.

The system provides a regulated power supply suitable for charging various mobile devices safely. Different charging durations can be assigned according to the inserted coin value. The timer circuit continuously monitors charging time and automatically disconnects the power supply after the specified duration is completed. This automated operation reduces power wastage and improves charging safety.

The proposed system offers many advantages such as low power consumption, easy operation, reduced human effort, automatic charging control, portability, and cost effectiveness. The system is especially useful in public utility applications where people require temporary charging support during travel or emergency situations. The charging station can support Android mobile phones, USB-powered devices, and other rechargeable electronic gadgets.

The implementation of the system combines both hardware and software technologies. The hardware section consists of coin acceptor modules, relay drivers, regulated power supply circuits, charging ports, microcontrollers, display units, and protection circuits. The software section controls timing operations, relay activation, charging duration, and system monitoring functions.