The current CPU tempterature will be printed on the Raspberry Pi terminal, and the fan speed

increases as the temperature goes up.

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Codes Analysis

1. First, import file control library and I2C library. The path to check Raspberry Pi's CPU

temperature is defined as TEMP_PATH.

2. Define parameters related to CPU temperature and I2C.

3. 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.