Automatic Room Lamp

DESCRIPTION :

First, let us understand why to use Automatic room Lamp? Now-a-days we are going through lots of advertisments of saving electric energy. With the help of Automatic room Lamp we can save and reuse energy. Find the simple block diagram of Automatic room Lamp.

BLOCK DIAGRAM of Lamp

BLOCK DIAGRAM of Lamp

The above block diagram of Automatic room Lamp used to disables the room lamp at day time and enables at night night time. Light Dependant resister(LDR) is the key element of Automatic room Lamp.

Operation:

We need to fix LDR Circuit near to the window/door of home where it can receive maximum sunlight.At day time if we open the door, the resistance of LDR Circuit reduces and leads the transister to remain in cut-off state. So the relay doesnot energize enough,and lamp remains off.
At night time, the resistance of LDR Circuit becomes high and its makes the transistor from cut off state to conducting state. The relay becomes energize and makes lamp to switch on.

We need power supply too operate the following operation.

 

BLOCK DIAGRAM OF Power Supply

BLOCK DIAGRAM OF Power Supply

This is block diagram of basic power supply circuit. Transformer is used to step up or step down the input voltage. The bridge circuit is used to convert the alernating current to a pulsating direct current. Since pulsating dc is not desirable, we used filter to convert it to more desirable dc. Regulator is used to maaintain the output of the power supply at a constant level.

Benefits :

Operated only at +5V(d.c)

No use of man power

Used in:

  • Houses
  • Educational Institutions
  • Medical halls
  • Shopping Malls