This is a simple and useful portable gadget can be used as a keyboard light at night for laptops and can be used as a usb powered table top lamp
Step 1: Parts
1 LED white (larger the better)
2 USB device (dead card reader, or Pen Drive)
3 Resistor 330 ohm
Step 2: Circuit Diagram
this is the circuit diagram and procedure...
Step 3: Conclusion
you can make modifications for purposes other than this and this can be used in your car mp3 player as a source of light and can be used where ever u find a usb hub just plug it in .... hope you like this... and rate it if you like it...