Python Script for Raspberry Pi fan speed control

fan.py

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BOARD)
GPIO.setup(12, GPIO.OUT)

fan = GPIO.PWM(12, 50) # Initialize PWM on pin 12 with 50Hz frequency
fan.start(0) # Start the PWM with 0% duty cycle

while True:
    temp = int(open('/sys/class/thermal/thermal_zone0/temp').read()) / 1000
    if temp < 38:
        fan.ChangeDutyCycle(0) # Turn off the fan if temperature is below 38C
    elif temp >= 38 and temp < 40:
        fan.ChangeDutyCycle(30) # Set fan speed to 30% if temperature is between 38C and 40C
    elif temp >= 40 and temp < 43:
        fan.ChangeDutyCycle(50)
    elif temp >= 43 and temp < 45:
        fan.ChangeDutyCycle(80)  
    else:
        fan.ChangeDutyCycle(100) # Set fan speed to 100% if temperature is above 45C
    time.sleep(5) # Wait for 5 seconds before checking temperature again