What is PWM? Pulse-width Modulation Go to https://github.com/sarfata/pi-blaster/ and Download. Installing:
sudo apt-get install autoconf
Then unzip pi-blaster-master.zip and do:
./autogen.sh
./configure && make
To start pi-blaster and have it relaunched automatically on every reboot:
sudo make install
  Afterwards it should look like this: /etc/init.d/pi-blaster.boot.sh start Using hardware: PWM Number of channels: 8 PWM frequency: 100 Hz PWM steps: 1000 Maximum period (100 %): 10000us Minimum period (0.100%): 10us

How to use

Pi-Blaster creates a special FIFO file in /dev/pi-blaster. Any application on your Raspberry Pi can write to it (this means that only pi-blaster needs to be root, your application can run as a normal user).
Important: when using pi-blaster, the GPIO pins you send to it are configured as output.
To set the value of a PIN, you write a command to /dev/pi-blaster in the form <GPIOPinName>=<value> where <value> must be a number between 0 and 1 (included). For a short example, this is how we set GPIO pin 17 to a PWM of 70%:
echo "17=0.7" > /dev/pi-blaster
  I figured out which Gpio-ports are working for revision B:
  
 GPIO number   Pin in P1 header   wPi numbers
      4              P1-7              7
      17             P1-11             0
      18             P1-12             1
      21             P1-13             2
      22             P1-15             3
      23             P1-16             4
      24             P1-18             5
      25             P1-22             6
   

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