I have an idea for a project but don't know how to go about it. I want to use a Uno to output short bursts (about one second each) of white noise to simulate the puffing of a steam locomotive. I presume I can't use a piezo as they only output one note at a time and white noise is many multiple notes. I also presume that I'd have to record and store a recording of white noise on an SD card. Can anyone give me some pointers, please.
Assuming that can be done, how could I get the output to fade from one speaker to another to simulate the locomotive moving? I envisage 3 or 4 speakers over a distance of about 16 feet.
The timing of the 'puffs' would be tied to the loco's speed, which is controlled by the Uno using a motor shield. High fidelity isn't a problem here. :)