Alternative solar charger for the cell phone

Solar energy is a renewable energy source. Source of energy produced directly by sunlight can be converted into electrical energy using solar cells. One of the applications using this system is mobile phone battery charger. This solar battery charger can save energy compared charger existing electrical socket while not contributing to environmental pollution. By the way, the disadvantage of this energy source is due to the dependence on the presence or brightness of sunlight. The purpose of this project is to produce a mobile phone battery charger using solar energy in other cases to reduce electricity consumption. This project uses two methods namely the comparator circuit and PIC16F877A to observe the voltage of the solar cells on a continuous basis. If the voltage drops below the permissible limits, the system will transfer the connection to the battery. If the allowed, the voltage will be set to normal use voltage setter. As a result, devices will get the energy going and protected from the effects of the lack of voltage and Over-voltage.