Running the arduino blink sketch, I tried switching the transistors around with emitter and collector...when I did that two lights were very dim and one was half as bright...I tried a TIP 120 (wiring everything a little different because the pin configurations are different) and same thing...just very bright lights but no HIGH to LOW, I also tried a PNP as well...the NPN I was mostly messing around with was, I believe a 2N4400 or something like that...I don't have it with me at the moment...
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via Egeo 16