DIY temperature controllable heat pad with a digital readout

Hey everyone. Just wrote up a DIY tutorial on how to make temperature controller. It uses an Arduino to control it and uses an amazon purchasable heating pad. I listed all of the materials with links in the blog in addition to a step by step guide.

http://highsimple.com/diy-bhoulder/part-1/

I attached some shots. Feedback and questions are more than welcome.

Thanks and good luck,
Motifaded