5v mini fan powered by arduino pro micro which controls its speed based on the readings from the DHT22
http://www.electroschematics.com/9540/arduino-fan-speed-controlled-temperature/#li-comment-1901048
Circuit
https://www.dropbox.com/s/mtxriv92rnuanxf/photo.JPG?dl=0
https://www.dropbox.com/s/bxujgfbx0r5kpap/Small-DC-motor.jpg?dl=0
https://www.dropbox.com/s/w06ywaj1gwyfyvd/Nano_DHT11.png?dl=0