3 USB LED lights

LEd lighting that is powered by usb port in your pc or laptop.
It s usefull when you need  light enough to light up your working space near your pc.

1-USB cable
    * diagram below for more information about the pins
1-White LED (any color will do depending on your preference)
     *see LED basic info for more info about LED properties
1-150 ohms 0.25W resistor
     * see  Resistor calculator  for resistor color code

USB pinouts

USB pin color designation
USB LED light schematic

The USB port in you computer or laptop provides a regulated 5V DC between the USB pin 1(VCC) and USB pin 4 (Ground). Connect the 150 ohms resistor and white LED using the designated pins as shown in the schematic above. If you are planning to change the values of resistor and color of LED just keep in mind that the current must be limited up to 20mA only. See the LED-Resistor calculator for more LED and resistor combination of your choice.


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