What is Raspberry Pi?
Raspberry Pi is a small, cheap computer that plugs into a computer monitor or TV, and uses a keyboard and mouse. It is a device that enables people of all ages to explore computing and help them to learn how to program in different languages like Scratch and Python.
It is able of doing everything that you expect a desktop computer can do, from internet browsing and playing high-definition videos, to making spreadsheets, word-processing, and playing games. And also it has the ability to interact with the outside world and has been used in a wide array of digital maker projects.
The latest model of Raspberry Pi comes with 1 GB of RAM (Random Access Memory), 1.2 GHz quad-core ARM (Advanced RISC Machines) Cortex-A53 processor, and basic levels of functionality that enables hobbyists, computer enthusiasts, and students to use this device for DIY projects.
Raspberry Pi board description
1. ARM CPU/GPU:
It is a Broadcom BCM2835 System on a Chip (SoC) that's made up of an ARM (Advanced RISC Machines) central processing unit (CPU) and a Video core 4 graphics processing unit (GPU).
The CPU handles all the computations that make a computer work (taking input, doing calculations and producing output), and the GPU handles graphics output.
2. GPIO HEADERS:
These are manifested general-purpose input/output connection points that will allow the real hardware hobbyists the opportunity to repair.
3. RCA VIDEO OUT:
An RCA(Radio Corporation of America) jack allows the connection of analog TVs and other similar output devices.
4. AUDIO OUT:
It is a standard 3.55-mm jack for connecting audio output devices such as headphones or speakers. There is no audio in.
5. LEDs:
Light-emitting diodes (LED), for all of your indicator purposes.
6. USB:
It is a common connection port for borderline devices of all types (including your mouse and keyboard). Raspberry Pi model A has one, and the Raspberry Pi model B has two.
You can use a USB hub to enlarge the number of ports or plug your mouse into your keyboard if it has its own USB port.
7. HDMI OUT:
This connector allows you to hook up a high-definition television or other suitable device using an HDMI cable.
8. POWER:
It is a 5v Micro USB power connector into which you can plug your suitable power supply.
9. SD CARD SLOT:
It is a full-sized SD card slot. An SD card with an operating system (OS) installed is required for booting the device.
They are available for buy from the manufacturers, but you can also download an OS and set it to the card yourself if you have a Linux machine and the wherewithal.
10. ETHERNET:
This connector allows for wired network access and it is only available on the Model B.
Different models of Raspberry Pi Boards
There are different models of the Raspberry Pi available -
1. Raspberry Pi 1 Model A
It has 256MB RAM, one USB port, for audio out HDMI Composite Video Processor (SoC) is a Broadcom BCM2835, 40 GPIO pins, and no Ethernet.
2. Raspberry Pi 1 Model B
It has 512MB RAM, Two USB ports, for audio out HDMI Composite Video Processor (SoC) is a Broadcom BCM2835, and an Ethernet port. It contains an ARM1176JZFS (ARM11 using an ARMv6-architecture core) with floating point, running at 700Mhz, and a Video core 4 GPU.
3. Raspberry Pi 1 Model A+
It has 512MB RAM, one USB port, for audio out HDMI Composite Video Processor (SoC) is a Broadcom BCM2835, 40 GPIO pins, and no Ethernet port.
4. Raspberry Pi 1 Model B+
Raspberry Pi 1 Model B+ is the final revision of the original Raspberry Pi. It has 512MB RAM (twice as much as the A+), four USB ports, for audio out HDMI Composite Video Processor (SoC) is a Broadcom BCM2835, 40 GPIO pins, and an Ethernet port.
5. Raspberry Pi 2 Model B
Raspberry Pi 2 Model B shares many specifications with the Pi 1 B+, but it uses a 900MHz quad-core ARM Cortex-A7 CPU and has 1GB RAM, for audio out HDMI Composite Video Processor (SoC) is a Broadcom BCM2836.
6. Raspberry Pi 3 Model B
Raspberry Pi 3 Model B was launched in February 2016; it uses a 1.2GHz 64-bit quad-core ARM Cortex-A53 CPU, which has 1GB RAM, for audio out HDMI Composite Video Processor (SoC) is a Broadcom BCM2837 integrated 802.11n wireless LAN, and Bluetooth 4.1.
7. Raspberry Pi Zero
Raspberry Pi Zero is half the size of a Model A+, with a 1Ghz single-core CPU and 512MB RAM, for audio out HDMI Composite Video Processor (SoC) is a Broadcom BCM2835 and USB On-The-Go ports.
These all Raspberry Pi Models share the following features -
Operating Systems(OS) - Raspbian RaspBMC, Arch Linux, Rise OS, and OpenELEC Pidora.
Video Output - HDMI Composite RCA
Supported Resolutions - 640x350 to 1920x1200, including 1080p, PAL & NTSC standards.
Power Source - Micro USB
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