How to Make an Automatic Night Light

Automatic night light is a device with turns on light when there is darkness in the surrounding.

Its a portable version of automatic street lights. In this I used LDR (Light Dependent Resistor) which varies resistance with respect to light intensity.

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Now I am going to instruct how to make an Automatic Night Light with less number of components.
Get Started..

Step 1: Components Required

LDR -1 ebay / Amazon

Resistor - 10k (x1)

Transistor - BC547 (x1) ebay / Amazon

9V Battery and Snap - 1

PCB -1 ebay / Amazon

LED -2

Step 2: Circuting

Place all components on PCB according to Circuit given above.

Note: adding a resistor of 330 ohms in series with led improves the lifetime of led.

Now solder all components.

Now solder 9V battery snap at respective terminals.

Place a piece of double sided tape on snap and stick the pcb to it.

Now connect battery to it.

For simulation fritzing file is attached

Step 3: Circuit Construction and Testing

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