rpi project to control fan based on temperature
HTU21DF.py - courtesy of dalexgrey via http://forums.adafruit.com/viewtopic.php?f=19&t=58695 Requires pigpio library : http://abyz.co.uk/rpi/pigpio/download.html
wget abyz.co.uk/rpi/pigpio/pigpio.zip
unzip pigpio.zip
cd PIGPIO
make
make install
To check the library
sudo ./x_pigpio # check C I/F
sudo pigpiod # start daemon
./x_pigpiod_if # check C I/F to daemon
./x_pigpio.py # check Python I/F to daemon
./x_pigs # check pigs I/F to daemon
./x_pipe # check pipe I/F to daemon
To compile, link, and run yourprog.c
gcc -o yourprog yourprog.c -lpigpio -lrt -lpthread
sudo ./yourprog
To start the pigpio daemon
sudo pigpiod
ambientTemperature requires requests module, see http://docs.python-requests.org/en/latest/user/quickstart/
sudo pip install requests