12v Light/Dark Switch

Project Abstract / Summary : Often, for certain low voltage lighting systems; you would like to turn off the lights during the bright light of the day. Most commercial day/night switches are designed for AC lighting. The circuit below was designed for a 12v DC system. But, it could be modified for other voltage as well. It uses an inexpensive phototransistor as the light detector. An n-channel FET is used to switch power to the lights. A transistor circuit is included to provide some hysteresis. This keeps the circuit from fluttering the light during the transition from day to night and night to day. It is recommended that a plastic tube be placed over the transistor to prevent it from being illuminated by the lights it is controlling. By selecting the appropriate power FET, the circuit could control over 100 watts worth of 12v lighting.

Why did you choose to work on this project topic : Solar Energy
Solar energy is one of my favorite topics because though its working is easy to understand but ideas related to this topic are very useful for our future energy needs.

Concept : Generally they work on this concept:

Solar Energy --->Solar Panel---> Electricity--->Machine(Grinder, Juicer, Mobile Charger, Bag etc.) or Storage(Battery)
Solar Energy-->Heat-->Cooking, Boiling, Water Filter etc .

Important thing to consider in your assignment is that how you can improve its efficiency either for boiling purpose or for heating.

Project Category : Mechanical / Automobile / Aeronautical
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Institute/College Name: JIET
City: Jaipur
State: Rajasthan
Participating Team From: Third Year