Introduction With the growing emphasis on renewable energy, integrating solar power into everyday applications is a step toward sustainable living. This project demonstrates how to build an automatic LED control system using a solar cell, diode, switch, LED, photoresistor, and an NPN transistor. The system ensures that the LED glows when solar power is available, while the battery remains off, effectively managing energy usage. Components Required Solar Cell (5V or higher, depending on LED requirements) Diode (e.g., 1N4007 to prevent reverse current) Switch LED (Light Emitting Diode) Photoresistor (LDR - Light Dependent Resistor) NPN Transistor (e.g., BC547) Resistors (as per required values) Battery (Rechargeable, 3.7V or 5V) Connecting Wires Breadboard How It Works Solar Power Supply: The solar cell converts sunlight into electrical energy, providing the primary power source for the LED. Photoresistor (LDR) Detection: The LDR detects ambient light levels. ...
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