Design of Coin Sensor based Mobile Charging System

Today, mobile phones play an important role not only in the modern world of communication, but also in our daily lives. The mobile phone business is currently worth billions of dollars and supports most features of all mobile phones with different operating systems. Therefore, running these phones requires a public charge, which should be useful to the general public. Hence, keeping mobile phones charged has become a more significant task. In this project, we designed a prototype for mobile battery charging on coin insertion. A coin-based mobile charging system provides an alternate solution to all mobile users for charging their mobile phones during travelling or emergency where they may not have access to conventional power banks. This system can be used by shop owners, the general public and can be implemented in public places like railway stations and bus stand to provide mobile charging facilities. This system can also be implemented in commercial complexes, colleges, and offices. This coin based mobile charging system charges the mobile phone when the valid coin is inserted. So the coin acceptor used recognizes the coin inserted and signals the Arduino Uno for further action. When a coin is inserted, it signals the Arduino Uno and starts charging the mobile phone providing a 5V power supply through the charging slot. The Arduino Uno starts a reverse countdown timer to display the charging time left for that mobile phone using LCD display. Further the user adds another coin, the Arduino Uno adds to the currently remaining time and once again decrements the countdown.