DIY Logging Thermometer

I wanted to make this project to learn how to integrate several modules into a working model; and also I have a practical need for monitoring temperatures in various places. The most recent need is to monitor a chicken brooder containing about 20 very young chickens (they started off as day old chicks a couple of weeks ago). In this Instructable I will describe the hardware components, the assembly, and the Arduino software. It was a big learning experience, especially the software. More on that later.”