Tom's Life Bits

The crawl space temperature and humidity are monitored via a DHT-22 probe dangling from the joists. This passes through the floor into the control room where it is attached to a Huzzah gathering Temperature and Humidity and sending the data via WiFi to the MQTT broker.

The MQTT topics are on Google Docs in the following spreadsheet:
Google Docs Topic definitions

The monitor is pictured here:

Wiring the DHT device:
Color code used: VDD = white/brown stripe, Data = blue, Common = brown
V+ is shown as VDD below.