Read the Pin mapping of Pi :
- Open the terminal
- Type gpio readall
- Displays the Pin number reference for both WiringPI library /Broadcom SOC channel (BCM) GPIO Pin numbering

Installing WiringPi library for our blink program. Install the wiringPi library from the link given below :
https://github.com/WiringPi/WiringPi
cd /tmp
wget https://project-downloads.drogon.net/wiringpi-latest.debsudo dpkg -i wiringpi-latest.deb
To verify if the WiringPI is installed and the Pinout

