automaticaly switch led at night

How to automaticaly switch an led at the night (ldr)

Needed

330 ohm resister
4.5k ohm resister

1k ohm resister
470 ohm resister
bc547 transister*2

Circuit diagram

How it is work
The basic consept of this project is: the led was switch on when the ldr gets dark (night time).

Basicaly ldr work in light (when ldr detects light the led was switch on)

But this circuit is reversed (work in dark)

Uses of this project
You successfuly done this project And place this in a permenent place.
this must work when is the power cut.

What is resistor
Resistor can converting electrical energy into heat.

If a matirial has a high resistance, it means electricity will struggle to get through it. The more the electricity has to struggle, the more energy is wasted. That sounds like a bad idea but some times resistance is far from ''useless'' and actually very helpfull.

Bc547 transistor
A transistor stands for transfer of resistance, is commonly used to amplify current. A small current at its base controls a larger current at collector and emitter terminals.

Bc547 is mainly used for amplification and switching purposes. It has a maximum current gain of 800. Its equivalent transistors are bc548 and bc 549.

The unit of resistance is ohm
ohm is a scientist his law called ohms law
(v=ir)

Comments

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