===== Humidity Monitoring =====
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:\\
[[https://docs.google.com/spreadsheets/d/1fnR15K5wrnArtJH7ZCU0acrIlH9RIHi7XJ_q_XNXhys/edit#gid=0|Google Docs Topic definitions]]\\

The monitor is pictured here:\\
{{::crawl_space_monitor.jpg|}}\\

Wiring the DHT device:\\
Color code used:  VDD = white/brown stripe, Data = blue, Common = brown\\
V+ is shown as VDD below.\\
{{:info:dht22_hookup.jpg|}}