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on video Automatic nightlight with full wiring diagram.

today I'm going to show you how to build easy USB power automatic night light with easy to understand wiring diagram in this video.

Unlike another automatic nightlight circuits, this circuit not just switch on and off but the circuit just add more light smoothly while environment darker.

The circuit consumes just .32 mAh per hour and can add up to 5 or more LEDs (five LEDs are recommended or just change some resistor value and attach a heatsink to output transistor).
As you can see in this video that I used 4  rechargeable battery and got 4.8 volts, so you can use USB as a power source too.

List of component
2 BD 139 transistors or equivalent transistor
1 100 ohms resistor
1 1000 ohm resistor
1 20,000 ohm resistor
1 photo resistor
1-5 LEDs (the more led the more power drain from battery)
 

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