I have a question about the current draw from the arduino 5v pin. Is it true that i can pull around 450mA from that pin(Usb powered, arduino uno itself use around 50mA or something close to that, so that leaves me 450mA IF all the digital pins are turned low).Thanks in advance !
But my first question is why use transistors? I hooked each layer up to a specific pin and when I want the layer off I just set the pin to HIGH. Is there an advantage to using transistors?