83.239.24.170: Migrated reply #4047

2023-10-06T16:53:22Z

Migrated reply #4047

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small refactoring of fan-rpi.py

#!/usr/bin/python3

# DON'T use pigpiod library on Nov. 24 2022 by Harry Huang
#import pigpio
import RPi.GPIO as IO
import time
import subprocess
import logging

servo = 18
logging.basicConfig(format='%(message)s', level=logging.DEBUG)
IO.setwarnings(False)
IO.setmode (IO.BCM)
IO.setup(servo,IO.OUT)
fan = IO.PWM(servo,2000)
fan.start(0)

def get_temp():
output = subprocess.run(['cat', '/sys/class/thermal/thermal_zone0/temp'], capture_output=True)
temp_str = output.stdout.decode()
try:
return float(temp_str)/1000
except (IndexError, ValueError):
raise RuntimeError('Could not get temperature')

while 1:
temp = get_temp() # Get the current CPU temperature
if temp > 60: # Check temperature threshhold, in degrees celcius
fan.ChangeDutyCycle(100) # Set fan duty based on temperature, 100 is max speed and 0 is min speed or off.
logging.debug("Temp: %d, speed: 100", temp)
elif temp > 50:
fan.ChangeDutyCycle(90)
logging.debug("Temp: %d, speed: 90", temp)
elif temp > 40:
fan.ChangeDutyCycle(85)
logging.debug("Temp: %d, speed: 85", temp)
elif temp > 32:
fan.ChangeDutyCycle(70)
logging.debug("Temp: %d, speed: 70", temp)
elif temp > 25:
fan.ChangeDutyCycle(60)
logging.debug("Temp: %d, speed: 60", temp)
else:
fan.ChangeDutyCycle(0)
logging.debug("Temp: %d, speed: 0", temp)
time.sleep(5) # Sleep for 5 seconds

CommentStreams:11e8ae6c4c76e6356e45a1e779a977bd - Revision history

83.239.24.170: Migrated reply #4047