Fermentation Control System

I've been assembling some electronics this week for a ice chest hack.

The problem I'm trying to solve is holding specific temperatures for

prolonged period. When fermenting foods and beverages the temperatures

are often between 60F-90F. The duration is as little as a few hours to

several weeks. I came up with a control system and where the user can

set a desired temperature and then follow the progress via a LCD or on-

line via pachube for data logging purposes. Holding the actual

temperature will be done with a peltier unit because it can both cool

and heat, but I need to build the H-bridge circuit so I can use one

peltier unit and drive it for both hot and cold. Today you can see the

schematic and breadboard. Feedback is welcome.

Done