Temperature and Humidity sensor (DHT11/DHT22) ¶

Software ¶

You can download the Arduino sketch here:
​http://code.mios.com/git_public/mios/arduino-sensor.git/tree/HEAD:/VeraArduino/Arduino/libraries/Vera/examples/HumiditySensor?js=1

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 ¶

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 ​DHT11 Temperature and Humidity sensor or ​DHT22 Temperature and Humidity sensor

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