Abstract: Now a day’s mobile phone has become a major source of business as well as personal communication. These solar panel convert sun light energy into DC current for a range of voltage that can be used for charging the battery. Mobile will get charge, only when a coin is inserted at the coin insertion slot. In this proposed system IR Sensor is used for the correct coin detection and we are adding START and STOP buttons to turn off the charging circuit and the timer. After inserting the coin, turn on the start button then the charging circuit will turn on. Suppose, if any call occurs in the middle of the charge press the stop button to turn off the charging circuit and then the charging circuit will turn off and at the same time timer will also turn off. Then after completion of call press the start button to continue that process without wasting the energy in battery and this all instructions will display on the LCD.

Key Words: Solar panel, Coin, Mobile, Charging circuit, IR sensor, Battery, LCD, Relay.

| DOI: 10.17148/IARJSET.2024.11351