the 2N2222A transistors should work fine. You need them to supply enough current to drive all them lights! If you tried to drive them just with the pin outs of the Arduino, then you wouldn't have enough current.
the 2N2222A transistors should work fine. You need them to supply enough current to drive all them lights! If you tried to drive them just with the pin outs of the Arduino, then you wouldn't have enough current.