Unsolved Script to turn off cooler

[Substring]

@azvarel the script looks like it takes 100% CPU, but it looks logically correct.
The electronic schematic is very simple and could help someone like @ian57 who wants to drive a 12V power supply

[lackyluuk]

@azvarel @Substring just add a time.sleep(1) or (2) into the while() loop

[tikiandskull]

Well, maybe i say a stupidity but with a thermal switch? It avoids the question of the script and you can choose one with a temperature of closing and opening of your choice.

[azvarel]

@tikiandskull nothing is stupid, any idea is valid, where would you find this thermal switch?

[tikiandskull]

@azvarel maybe something like this link text It can be found on amazon, conrad, etc some works in 5v others in 12v.

Afterwards, I do not know how it could be positioned, but probably with the probe as close as possible to cpu

(sorry for my poor English )

[Pdagarcia]

#!/usr/bin/env python3

import os
from time import sleep
import signal
import sys
import RPi.GPIO as GPIO

pin = 27 # The pin ID, edit here to change it
maxTMP = 50 # The maximum temperature in Celsius after which we trigger the fan
sleepTime = 30 # The time to sleep between temp checks

def setup():
GPIO.setmode(GPIO.BCM)
GPIO.setup(pin, GPIO.OUT)
GPIO.setwarnings(False)
return()

def getCPUtemperature():
res = os.popen('vcgencmd measure_temp').readline()
temp =(res.replace("temp=","").replace("'C\n",""))
print("temp is {0}".format(temp)) #Uncomment here for testing
return temp

def fanON():
print("Fan on ...")
setPin(True)
return()

def fanOFF():
print("Fan off ...")
setPin(False)
return()

def getTEMP():
CPU_temp = float(getCPUtemperature())
if CPU_temp > maxTMP:
fanON()
sleep(sleepTime) # Sleep additional time in order to ensure that we stay below max temp ...
else:
fanOFF()
return()

def setPin(mode): # A little redundant function but useful if you want to add logging
GPIO.output(pin, mode)
return()

try:
setup()
while True:
getTEMP()
sleep(sleepTime) # Read the temperature every x amount of seconds ...
except KeyboardInterrupt: # trap a CTRL+C keyboard interrupt
GPIO.cleanup() # resets all GPIO ports used by this script

[Pdagarcia]

With this transistor 2N4401 600 mA, 40V and 5v fan Works perfectly.

[azvarel]

@Pdagarcia where would you put this script?

[lackyluuk]

@azvarel I would place the script into /recalbox/scripts and call the script as a background process from the startup directory /etc/init.d for example as S32StartFanControl
This could look like this (just one proposal, you can do it however you like it):

#!/usr/bin/python

import subprocess

try:
    subprocess.Popen(["python","/recalbox/scripts/fanControl.py"])

except KeyboardInterrupt:
    print "Quit"

I have called my script that I start as fanControl.py

[azvarel]

@lackyluuk thanks

[marcelogarbin]

@azvarel I'm with the same problem, did you work? which method did you use?