DIY - Dark(Light) Detector / Sensor OR Automatic Street Light

Overview:

It is a simple and powerful concept , which uses transistor ( BC 547 NPN) as a switch to switch ON and OFF the street light system automatically .

It automatically switches ON lights when the sunlight goes below the visible region of our eyes. ( e.g in evening after Sunset ).

It automatically switches OFF lights when Sunlight fall on it ( e.g in morning ) , by using a sensor called LDR (Light Dependent Resistor) which senses the light just like our eyes.

Step 1: Items Required

So, For making this basic sensor , you will be required some basic items which can be easily purchased from a local electronics shop for some bucks.

Here are the parts which are required :-

1. 1 X BC547 ( Very Common Transistor)

2. 1 X 5mm LED

3. 1 X 220k Ohm Resistor

4. 1 X 330 Ohm Resistor

5. 1 X LDR (Light Dependent Resistor)

6. Soldering Items and a perfboard

    7. Couple of wires

Step 2: Circuit Diagram

                              

Fritzing:

Just follow the circuit diagram and you will get your Dark Sensor ready at no time!!!

See the following video tutorial of Dark Sensor/Detector :

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