As in today’s world, mobile phone has become a necessary thing for the people. Today’s technically advanced mobile phones are capable of not only receiving and placing the calls but also can store data, taking pictures and many more. Mobile phones help us to stay connected with others and provide the user high security. As the use increases an equal amount of power is required to run the application. As in regular routine we can charge the phone easily but as routine changes and if we are on a long journey or in emergency or in some unpredictable situations where we require emergency mobile charging that time coin insertion mobile charging system plays a vital role where one easily charge their phone at public place at less cost. This system consists of coin sensing module that recognises valid coins and then signals the microcontroller for further action. If a valid coin is sensed it’s signal is sent to microcontroller and then microcontroller starts the charging mechanism providing a 5V supply through the power supply. Now the system also to monitor the amount of charging to be provided. So the microcontroller starts the reverse countdown timer to display the charging time for that mobile phone. Now if the user inserts another coin in that time, the microcontroller adds the time to currently remaining charging time and starts the reverse countdown. The system also uses renewable resource like solar energy charge the mobile phone by converting solar energy into electrical energy. This system also have secondary source as AC input in rainy season. The system also have solar tracking subsystem which ensures that maximum utilization of solar energy is done.So this system can be used for smart mobile charging at public places.

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