1. Import file control library and I2C library, the path to check CPU temperature of Raspberry Pi is

defined as TEMP_PATH.

2. Define RGB LED and I2C parameters

3. Define temperature related parameters

4. Open CPU temperature file circularly and save fd_Temp (In Linux, everything is a file). If it fails to

open, return - 1. Next, read the temperature and save it in buf. also returns - 1 when failed.

After the temperature reading is saved to buf successfully, it need to be divided by 1000

because the value is relatively large, then the current temperature can be obtained in

centigrade, and save it to temp. Run the close() function to close the file manually after reading

the file.