Usb lamp with dark sensor

this is a cheap and easy way to use the usb power for the purpose of getting light. it consists of led, a transistor and some resistors. this can be used as a light source for the webcams at night, it can also be used  as a table lamp . if you like the circuit please rate it .    

Step 1 Parts list

12 x   bright white leds 120⁰ 
1    x  2N3904
1    x 100 r resistor
1    x  10k resistor
1    x  usb cable 
1    x 10 r 1/2 watt resistor
1    x LDR

Comments

[tomx63]

Where is the LDR in the finished product? Very nice instructable. Well done!

[sooraj619]

thanks

[arnefl]

And you don't follow your own circuit diagram. That is confusing for those who look at your pictures.

[sooraj619]

please point out where it is wrong

[arnefl]

It should not be difficult for the author to find that, but where is your 10 Ohm 1/2W resistor on your schematic??

[arnefl]

And maybe a LDR should be in the part list as well.
Apart from that, the circuit works well.

[sooraj619]

sorry, i will edit it and thank you

[frank26080115]

What schematic editor is that?

[sooraj619]

ExpressPCB software