I am trying to control a strip of leds that run at 12v a share a ground.
At my use I have 3 TIP42 PNP Transistors. and two Darlington Driver 8-Channel ULN2803 DIP, as far as transistors go.
I thought I could get away with just using the pnp's to work the leds but it's not working. Can anyone recommend a schametic that will work? Does the arduino have to have the same ground as the LED or can I power the leds from a 12v source and the arduino from usb or some other power source?