Raspberry Pi GPIO: Basic Fan Control

Python Code:

Now, let’s write the Python code to control the cooling fan based on the Raspberry Pi’s temperature.

from gpiozero import CPUTemperature
import RPi.GPIO as GPIO
import time

fanPin=11
GPIO.setmode(GPIO.BOARD)
GPIO.setup(fanPin, GPIO.OUT)

cpu = CPUTemperature()
print(cpu.temperature)
try:
    while True:
        if cpu.temperature > 50.00:
            GPIO.output(fanPin,GPIO.HIGH)
        else:
            GPIO.output(fanPin,GPIO.LOW)
            
        cpu = CPUTemperature()
        print(cpu.temperature)
        time.sleep(10)
except KeyboardInterrupt:
    GPIO.cleanup()
    print('GPIO Shutdown, Pins cleared')

Explanation:

• Import CPUTemperature from gpiozero so we can read the temperature.
• Import the RPi.GPIO library and set the GPIO mode to BCM.
• Define the GPIO pin for controlling the fan.
• Set up the fan pin as an output and continuously monitor the Raspberry Pi’s temperature.
• If the temperature exceeds a threshold (50°C in this example), turn on the fan to cool the Pi.