It works !!!! Thank you so much HarryH 
For those who wants details, here is the content of fan_control.py:
Python
#! /usr/bin/env python3
import os
import time
import signal
import sys
sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')
os.environ['LG_WD'] = '/tmp'
from gpiozero import PWMOutputDevice
# Configuration
FAN_PIN = 18 # BCM pin used to drive PWM fan
WAIT_TIME = 2 # [s] Time to wait between each refresh
PWM_FREQ = 25 # [kHz] 25kHz for Noctua PWM control
# Configurable temperature and fan speed
MIN_TEMP = 42 # under this temp value fan is switched to the FAN_OFF speed
MAX_TEMP = 68 # over this temp value fan is switched to the FAN_MAX speed
FAN_LOW = 30 # lower side of the fan speed range during cooling
FAN_HIGH = 99 # higher side of the fan speed range during cooling
FAN_OFF = 20 # fan speed to set if the detected temp is below MIN_TEMP
FAN_MAX = 100 # fan speed to set if the detected temp is above MAX_TEMP
# Get CPU's temperature
def getCpuTemperature():
with open('/sys/class/thermal/thermal_zone0/temp') as f:
return float(f.read()) / 1000
def setFanSpeed(speed):
pwm_fan.value = speed/100 # divide by 100 to get values from 0 to 1
return()
# Handle fan speed
def handleFanSpeed():
temp = float(getCpuTemperature())
#print("cpu temp: {}".format(temp))
# Turn off the fan if temperature is below MIN_TEMP
if temp < MIN_TEMP:
setFanSpeed(FAN_OFF)
#print("Fan OFF") # Uncomment for testing
# Set fan speed to MAXIMUM if the temperature is above MAX_TEMP
elif temp > MAX_TEMP:
setFanSpeed(FAN_MAX)
print("Fan MAX") # Uncomment for testing
# Caculate dynamic fan speed
else:
step = (FAN_HIGH - FAN_LOW)/(MAX_TEMP - MIN_TEMP)
temp -= MIN_TEMP
setFanSpeed(FAN_LOW + ( round(temp) * step ))
#print(FAN_LOW + ( round(temp) * step )) # Uncomment for testing
return ()
try:
pwm_fan = PWMOutputDevice(FAN_PIN, initial_value=0,frequency=PWM_FREQ) # initialize FAN_PIN as a pwm output
setFanSpeed(FAN_OFF) # initially set fan speed to the FAN_OFF value
while True:
handleFanSpeed() # call the function that calculates the target fan speed
time.sleep(WAIT_TIME) # wait for WAIT_TIME seconds before recalculate
except KeyboardInterrupt: # trap a CTRL+C keyboard interrupt
setFanSpeed(FAN_HIGH)
#finally:
# pwm_fan.close() # in case of unexpected exit, resets pin status (fan will go full speed after exiting)Here is the content of autostart.sh:
Bash
#!/bin/bash
(
sleep 180
sh /storage/.config/fan_control.sh start
)&Here is the content of fan_control.sh:
Code
#! /bin/sh
### BEGIN INIT INFO
# Provides: fancontrol.py
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
### END INIT INFO
# Carry out specific functions when asked to by the system
case "$1" in
start)
echo "Starting fancontrol.py"
/storage/fan_control.py &
;;
stop)
echo "Stopping fancontrol.py"
pkill -f /storage/fan_control.py
;;
*)
echo "Usage: /storage/.config/fan_control.sh {start|stop}"
exit 1
;;
esac
I will stay on LE 11.0.6 until it's fixed !