- [Narrator] Computers can be thought of
as a calculating machine with four parts.
Input, memory, processing and output.
Every computer provides a way to give information.
Most often, we think of a keyboard and a mouse.
But it can also be Wi-Fi, and ethernet and serial ports,
or specialized electronics.
The raspberry pie has all of these methods
on the circuit board.
And especially provides a set of pins
for input of electronic signals.
Computers use memory to, well, remember things.
This can be internal, such as random access memory or RAM.
Or read-only memory or ROM.
Computers also have external mass storage
such as a hard drive or cloud storage.
The raspberry pie has memory as well.
It uses an onboard memory chip
and an SD card for external storage.
The raspberry pie can also use USB flash drives
for external storage.
A computer wouldn't be a computer
unless it could perform math.
That's the role of a central processing unit.
In smaller computers, this is contained
inside a system on a chip, SOC.
On a raspberry pie, there is an arm CPU and a Broadcom SOC.
And SOC is for system on a chip
which is nice to know but pretty much useless information.
It's enough to know the raspberry pie
will perform calculations.
You don't need to know what processor
it is using to do that.
Finally, a computer has a way to provide information
back out to the world.
Most often, this is output to a video monitor,
but it can also be controlling motors,
or sending data to other computers.
On the raspberry pie, there is an HDMI video port
as well as network connections.
The raspberry pie also has pins
to send electronic signals to devices.
This is the purpose of the general
purpose input output or GPIO.
It's best to think of a raspberry pie
as just another computer.
It's smaller but it does everything
a full size computer can do.