International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 01 | Jan -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1384 Mobile Battery charger on Coin Insertion Mr.Patil K.N. 1 , Mr.Sagar Patil 2 , Mr.Harshavardhan Kamble 3 , Mr.Kshitijkumar Sawant 4 1 Assistant Professor, Department of Electronics And Telecommunication , Annasaheb Dange College of Engineering and Technology, Ashta, Maharashtra, India 2 Student, Department of Electronics And Telecommunicatio, Annasaheb Dange College of Engineering and Technology, Ashta, Maharashtra, India 3 Student, Department of Electronics And Telecommunication, Annasaheb Dange College of Engineering and Technology, Ashta, Maharashtra, India 4 Student, Department of Electronics And Telecommunication, Annasaheb Dange College of Engineering and Technology, Ashta, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract: Now a days mobile phones are play’s important role in the present communication world as well as day to day life. This paper describes the mobile battery charger on coin insertion. The mobile phone business is currently worth billions of dollars and supports of most number of features in every mobile phone with different operating systems. So to operate these mobile phones public charging is needed, and it should be useful to public. This is designed based on ATMEL 89c51 a 40-pin micro controller that does the countdown timings for a period of 5 minutes with LCD displays showing the actual time left. During the timing period a relay output is latched and finishing timing in progress. Recommended locations include: Hotels, Conference centers, Exhibition halls, Serviced offices, Exchange halls, Hotels, Health clubs, Training centers, Golf clubs, Retail outlets, Shopping malls, Internet cafes, Universities, Colleges, Hall of residence, Airports, Train terminals, etc., so that the mobile phone users can reactivate a low or dead battery by simply plugging in and charging for one rupee. Keywords: Mobile Phone, Battery Charger, LCD display, ATMEL microcontroller 1. INTRODUCTION The mobile phone market is a vast industry, and has spread into rural areas as an essential means of communication. While the urban populations use more sophisticated mobiles with good power batteries lasting for several days, the rural populations buy the pre-owned mobile phones that require charging frequently. Many times battery becomes flat in the middle of conversation particularly at inconvenient times when access to a standard charger isn't possible. The coin-based mobile battery chargers are designed to solve this problem. The user has to plug the mobile phone into one of the adapters and insert a coin; the phone will then be given a micro pulse for charging. It does not bring a mobile from 'dead' to fully charged state. The charging capacity of the mobile is designed with the help of pre-defined values. It is of course, possible to continue charging the mobile by inserting more coins. This compact and lightweight product is designed to cater for the growing number of rural mobile users worldwide. A suitable microcontroller is programmed for all the controlling applications. The source for charging is obtained from direct power grid. 2. RESEARCH METHODLOGY 2.1: Problem Identified: Now a days students and many other people use the public transportation ,people who are making every long journey in order attend business conventions ,conferences, or for any private purpose don’t know their battery level is low and they often forget their charger at home or it in hotel room. Many critics argued that long distance travelling vehicles provides power points. Even through one or two power points are provided at a particular place in the vehicles it is not all sufficient for all passengers, therefore need to provide a public charging service is essential and coin based mobile charging are designed to solve these problem 2.2: Proposed Work To overcome disadvantages mobile battery charging, we are going to implement Mobile battery charge on coin insertion system. The charging Time period is calculated by using Atmel 89c51microntroller and after that microcontroller display the remaining time period. When Time period reaches to zero automatically power supply will cut by using relay circuit. 3. BLOCK DIAGRAM: The 230 volt AC supply is given to the step down transformer because Atmel 89c51 microcontroller support to 5 volt only. After that AC voltage is converted in to DC voltage by using rectifier. Then fixed DC voltage is