I have a Arduino Nano and I'm trying to run this Piezo Siren off the circuit. The Arduino is currently powered by a USB plug. The siren expects 6-14v and the digital output pins on the nano are giving me about 4.6v. If I run the siren directly from VCC to ground (around 4.70v) then it works, but if I go from a digital output to ground then I get no sound (I do get sound from a smaller speaker on the same pins). If I use the exact same setup with my Arduino Duemilanove then it works as well.
What is the easiest way to get this siren to work based on a trigger from the Arduino? (A bonus would be if I can get the required parts in store from RadioShack so I don't have to wait on shipping anything...)