Since Raspberry Pi has only about 8 GPIO’s (or up to 17 if you reconfigure UART, SPI and I2C as GPIO) or for some other reasons, it may be helpful to combine Raspberry Pi with another μC or PIC (or even a ready-to-use μC-/PIC-Board like Arduino, Netduino or Pinguino) e.g. to get more I/O’s or just to seperate two different application areas. Such a combination is surely easy to setup via serial or usb - but at least if serial/usb is already in use or if you are thinking about using more than one further μC or PIC its getting a bit clumsy. Much more flexible and cleaner will be a solution via I2C - in this case you can easily address up to 128 slaves.
Anonymous asked: which is the most perfect geometrical figure?
I’m not sure, Anonymous! I’m just going to say it’s the circle.
Anywho, while trying to form an opinion on the answer to your question, I looked up “circle” on Wikipedia and found this picture:
"Area enclosed by a circle = π × area of the shaded square." I know it’s not very impressive, but I’ve just never thought of it like that! Thanks, Anon.