How often do we upgrade our devices like Smartphones, television, laptops, or even cars or motorcycles?
It is also true that we get adapted to easier methods and accessibility.
So this given using Raspberry Pi, we can say that it almost an up-gradation in the field of circuit interfacing and building devices.

Raspberry Pi is more than just a #microcontroller, it is a Microcomputer. It is made by the Raspberry Pi foundation in the UK, which is basically a charity organization working to educate people in computing.
It has the ability to store the functional Raspbian OS in an SD card.
This makes the code secure and doesn't cause any change when other commands are given. With this advantage, let us get on with the total description of Raspberry Pi and the types of boards available.
Let us first know how to interface Raspberry Pi with the code.
Raspbian OS

Unlike #Arduino IDE, Raspberry Pi doesn't have an IDE specifically for the boards to be interfaced. Raspberry Pi code can be written in a Python IDE and the OS can be stored on an SD card.
The code written in a text file should be stored in.py format and then execute code.
In the system, we have to first install the #Raspbian Operating system according to the system requirements. The software will ask for access to Audio, video, and other external components that can give inputs, the permission can be given for the same.
The SD card must be inserted into the port of the Raspberry Pi board.
Note that the network to which the Raspberry Pi board and the System is connected must be the same. The password and credentials for the same can be entered when OS is first installed.
Visit this website to download the Raspbian OS software.
Next, the code written in a file of.py format should be saved in a specific and unique name and the terminal or the #SSH terminal (Secure Socket Shell) needs to be opened. The command should be given such that we open the file containing the code to be executed. By following these steps the Raspberry Pi board can be interfaced and the code and commands can be executed.
Also, check out NOOBS by Raspberry pi which can also be used to install as software and be accessed by the SD card.
The SSH terminal will look like this window.

Check out this website to download an IDE for Python.
Other IDEs allow saving files in #Python and interface with boards like Raspberry Pi. Also, there are other methods through which the Raspberry Pi board can be connected to the system and interfaced. We can use USB and Ethernet connections from the board to the system for #interfacing.
Coming to the #code specifications, different Header files with library functions are used in a programming language usually. The header files vary depending on the functions used according to the project requirements. Here according to the Python syntax, we will be importing classes containing functions that will be used in the code.
Ex. from pushbullet import Pushbullet
import RPi.GPIOasGPIO
import time
Now let us look at the PIN and Port specifications of a Raspberry Pi board. by considering the Raspberry Pi-2 board.
PIN Specifications
