[[Image(humVera.png, align=right, width=400px)]]
= Temperature and Humidity sensor (DHT11/DHT22) =

== Software ==
You can download the Arduino sketch [[https://github.com/mysensors/Arduino/tree/master/libraries/MySensors/examples/HumiditySensor]].\\

This sensor sleeps most of the time. You can change the sleep interval by updating SLEEP_TIME define at the top of the file. 

== Wire things up ==
[[Image(dht22.jpg, align=right)]]

Follow the instructions in ConnectingRadioModule to connect radio module.

To connect the DHT22 sensor to the Arduino board follow these instructions:\\
Pin1. Connect VCC of the DHT22 sensor to +5V\\
Pin2. Connect Data to digital pin 3 of the Arduino board\\
Pin3. Not used.\\
Pin4. Connect to Ground\\
\\
Use also need a pull up resistor between +5V and Data. See picture below.\\

== Hardware - Purchase guide ==

To build this sensor you'll need one arduino + radio specified in the base kit found here:\\
http://code.mios.com/trac/mios_arduino-sensor/wiki/WikiStart#Buyingguide\\
The DHT humidity sensor exists in two versions 11 and 22. The 22-version is a bit more accurate than 11.

1x of [[http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575069610&toolid=10001&campid=5337426682&customid=&icep_item=251132830173&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg|DHT11 Temperature and Humidity sensor]] or 
[[http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575069610&toolid=10001&campid=5337426682&customid=&icep_item=261070585099&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg|DHT22 Temperature and Humidity sensor]]

TOTAL SENSOR PRICE: $7.6 (arduino + radio) + $5 (DHT22) = '''$12,6'''

[[Image(hum.jpg, width=500px)]]