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

file. rgb.c is source program, and -lwiringPi means to use the wiringPi library in Raspberry Pi.

•

Run the program

./rgb

Three RGB LEDs light up in green at the same time.

•

Codes Analysis

1. There are three RGB LEDs on the board, so we define the number of light as 3, declare setRGB

and closeRGB function.

2. void setRGB(int num, int R, int G, int B) function:

Set RGB LED color. num refers to the LED number: o is the first LED, 1 for the second LED, 2

for the third LED. When num is over 3, it means to set all the LEDs. The range of R, G, B is

0~255.