Seth writes -

After a month of messing around, I finally got my act together and started working on my PID heating pad controller. Well, actually it is only a P heating pad controller right now, but I will go into that later.

The Goal: Create a PID controlled heating pad to regulate the temperature of a Bio-Dome.

I got two Arduinos for Christmas, so I had most of the hardware to control the heating pad. I was hoping that I would just be able to modify the pad’s circuits, but it is not just an on and off switch and the only IC on it was made in China by some unknown company so I could not find any info on it.

Jerd King – Link.