Invoke gcc compiler. -o means to generate files, and will be followed by the name of generated

file. oled.c and ssd1306_i2c.c are the source programs, and -lwiringPi means to use the wiringPi

library in Raspberry Pi.

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Run the program

./oled

Now, you can check the CPU utilization, CPU temperature, operatiing memory utilization, disk

utilization, IP address and other information of your Pi on the OLED screen.

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Codes Analysis

1. Import wiringPi/I2C library, oled display library, file control library, IP reading library, and disk

reading library.