Freematics Forum

Has the arduino interface a sound output, or could I drive a small pump motor with it? Having a PC on board is rather cumbersome. I am trying to solve the tinkering part for this:
http://www.mediafire.com/view/l18u5xg0x ... oolish.pdf

Perhaps use a fuel injector or throttle body injector, but instead of fuel, have a pump feed it with water or steam. An Arduino can control a relay which can send 12v to the injector to squirt some water in when you want it. Interesting project!