Add a Cool Features to USB ...View Instructable »
How to Make 3x3x3 Led CubeView Instructable »
Emergency Phone ChargerView Instructable »
Hand Power Electricity Gene...View Instructable »
Conclusion & Going Further
How to Print PCBView Instructable »
Resistor is for LED(Just as an indicator), I have use 2.2kand there is also a linear voltage regulator (7805) , for external power source.Use computer or laptop USB port as power source then no need these components.For more information just mail or comment..
I will give you all details, just leave your email id..or just contact firstname.lastname@example.org
I have used multimeter....
How to Make Arduino Based ...View Instructable »
How to make Arduino Based Mini CNC Machine A complete tutorial