Welcome to Raspberry Pi 4B repository

1. Install nano editor,gcc compiler and Git

sudo apt-get install gcc
sudo apt-get install nano
sudo apt-get install git

2.Install wiringPi

2.1 Enter the following command to download the WiringPi file to the current directory on the Raspberry Pi system.

sudo git clone https://github.com/WiringPi/WiringPi

Wait patiently for its installation to complete.

2.2 After the download is complete, we can see a WiringPi folder in the current directory. As shown below.

2.3 Input the following command to enter the WiringPi folder directory.

cd WiringPi/

2.4 Input the following command to install WiringPi.

sudo ./build

Wait patiently for its installation to complete. The interface shown below, without any error, it means that the installation is complete.

2.5 Enter the following command to view the version number. 

gpio -v

2.6 We enter gpio readall, we will find that there is no error prompt, and we can display the status of each pin of Raspberry Pi, as shown in the figure below.