[[Image(humVera.png, align=right, width=400px)]] = Temperature and Humidity sensor (DHT11/DHT22) = == Software == You can download the Arduino sketch [[http://code.mios.com/git_public/mios/arduino-sensor.git/tree/HEAD:/VeraArduino/Arduino/libraries/Vera/examples/HumiditySensor?js=1|here]].\\ 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://www.kqzyfj.com/click-7319170-10881559?url=http%3A%2F%2Fwww.aliexpress.com%2Fitem%2FDHT11-Digital-Temperature-and-Humidity-Sensor%2F543041504.html|DHT11 Temperature and Humidity sensor]] or [[http://www.tkqlhce.com/click-7319170-10881559?url=http%3A%2F%2Fwww.aliexpress.com%2Fitem%2F1pcs-DHT22-digital-temperature-and-humidity-sensor-Temperature-and-humidity-module-AM2302-replace-SHT11-SHT15-Free%2F1031321543.html|DHT22 Temperature and Humidity sensor]] TOTAL SENSOR PRICE: $7.6 (arduino + radio) + $5 (DHT22) = '''$12,6''' [[Image(hum.jpg, width=500px)]]