I am a newbie with an arduino uno, using the starting kit of oomlout.
I have done the blinking led project and no problem with the variations (fading etc.) But I have problems with the second project, the knight rider with 8 leds. I think everything is Ok, but only 4 leds that are nearest to the ground wire work, and if I change the ground wire to the other side the other four leds start working and the first four don't work. You can see it here:
After this try, I have tried putting a wire next to the "- to ground" wire, "from + to 5v" with the same result. I have put pinheads in the corners too, and the same result.
I have done those last changes because the diagram of oomlout is that way http://www.oomlout.com/a/products/ardx/circ-02 but I have seen some other tutorials for the same Knight rider and they don't use the pinheads and the 5v wire. Besides, I am using 560 Ohm resistors, but in other webs I have seen that they are using 200 Ohms resistors. Maybe the reason is that 560 Ohm is the smallest resistor of the kit?
And one last question I have seen this other diagram: http://arduino.cc/es_old/Tutoriales/CocheFantastico If I understood well, the resistor must be between the anode of the led and the ground, but here the resistor goes to the pin (?).
Any ideas, please?