FANS What You'll Need
Raspberry Pi Fully loaded with RasPiViv installed	Fans Two mini 5v blower fans	Jumper Wires Used to connect the sensors to the GPIO	Parts Two 2N222 Transistors & two 10k Resistors
Installing & Configuring Fans In this build we have two small 5v blower fans used to regulate humidity in each vivarium The 5 volt fans were chosen because the Raspberry Pi can supply 5 volts. You can easily add your own power supply for higher power fans.
	STEP 1 Connect the positive fan wires to 5 volt pint Connect the negative fan wires to E (Emitters) of the transistors Ground both C (collectors) of the transistors Connect GPIO 5 & 6 (physical pins 18 & 22) to B (Base) of the transistors with a 10K resistor
	STEP 2 Open a browser and visit your Raspberry Pi Vivarium Controller "manual Controls" page and test your fans NOTE: Buttons will show what will happen when clicked, not the current state of the device.
STEP 3 Set the Fan's humidity threshold sudo nano /var/www/html/fanh1.php Edit the threshold of your desired value Repeast for fan #2 sudo nano /var/www/html/fanh2.php
STEP 4 Create a cron job to regulate humidity * /5 * * * * php /var/www/html/fanh1.php * /5 * * * * php /var/www/html/fanh2.php
FINISHED The Raspberry Pi Vivarium Controller will check the humidity readings every 5 minutes and authomatically turn on the fans if the humidity is above your threshold Your may use the same method to control other vivarium components such as heaters, misting and lighting.
FINISHED! How'd it work for you?