Seems like all of the uses of PLCs are in industrial settings. I remember reading an article a year or two back that discussed the pros and cons of home automation, and a couple of the major cons were the high price for equipment, and the need to constantly upgrade as components became obsolete. I can't help but think that PLCs might be well suited to the task, that with a couple of small HMI devices and a PLC you could automate a house pretty easily. Of course, if it's that simple, but isn't being done, that probably means there's something I'm missing. What do you guys think?