Digital control for agitating during etching

[iaresee]

I'll admit I've etched precisely two PCBs in my life and neither was etched in the last 10 years. I don't recall having to wait 20 minutes for the etchant to work though. But if, like this guy, you're stuck over a tray agitating for 20 minutes at a time his solution might appeal:

http://blog.makezine.com/archive/2009/06/pcb_etching_with_the_make_controlle.html?CMP=OTC-0D6B48984890

[MikeH]

I thought about doing something like this once- I took apart an old playstation controller and there two motors in there with pendulums on them to make the controller vibrate.  I played with the idea of mounting them on my etching container to make the whole thing sort of vibrate to agitate the solution.  But then I switched to muriatic and I don't worry about agitation anymore.  Except on my eyes from the fumes... heh heh.