=added fan_controller_LE12.py for Libreelec 12

fan_controller_LE12.py

@@ -0,0 +1,116 @@
+#!/usr/bin/env python3
+# (C) 2022 FUEL4EP (Creative Commons)
+# license: https://creativecommons.org/licenses/by-nc-sa/4.0/
+import sys
+sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')
+
+import os
+import time
+from gpiozero import PWMOutputDevice
+import glob
+
+minimum_always_ON=True
+minimum_speed=30
+turn_on_speed=65
+target_temp=52
+sleepTime=20
+debugFlag=False
+
+current_speed=0
+
+thermal_zones_temp_dirs=glob.glob("/sys/class/thermal/thermal_zone*/temp")
+
+
+def getCPUtemperature():
+ res = os.popen('vcgencmd measure_temp').readline()
+ #vcgencmd measure_temp -> res="temp=NN.N'C\n"
+ #temp =(res.replace("temp=","").replace("'C\n",""))
+ temp=res[5:9]
+ try : 
+ temp= float(temp)
+ except :
+ print("vcgencmd measure_temp failed")
+ temp=getCPUTemperature2()
+
+ return temp
+
+def getCPUTemperature2():
+ temps=[]
+ for file_dir in thermal_zones_temp_dirs:
+ with open(file_dir, "r") as file:
+ try :
+ temps.append(float(file.read()))
+ except :
+ print("Error reading from file {}".format(file_dir))
+ continue
+
+ if len(temps) == 0:
+ print("reading from sys files failed, no CPU temp detected using target_temp")
+ temps.append(target_temp * 1000)
+
+ return max(temps) / 1000
+
+def setPWMvalue(speed):
+ myPWM.value = speed/100 # divide by 100 to get values from 0 to 1
+ return()
+
+def setDutyCycle(new_duty):
+ global current_speed
+ if (current_speed != new_duty):
+ if (new_duty < 50 ):
+ if (new_duty > 0 ):
+ #set duty cycle to turn_on_speed % for 1 second after a change of the duty cycle in order to ensure the start of the fan
+ setPWMvalue(turn_on_speed)
+ time.sleep(1)
+ setPWMvalue(new_duty)
+ current_speed=new_duty
+ if debugFlag:
+ print("new PWM duty cycle = ", current_speed)
+ time.sleep(sleepTime)
+ return
+
+try:
+ #GPIO pin BCM24 is used for the fan PWM control; start at 100%, PWM frequeny is 50Hz
+
+ myPWM = PWMOutputDevice(24, initial_value=1,frequency=50) # initialize; see also https://github.com/franganghi/Raspberry-Pi5-PWM-Fan-Control/blob/master/fan_control.py
+
+ current_speed=100
+ if debugFlag:
+ print("initial PWM duty cycle = ", current_speed)
+
+ while True:
+ temp = getCPUtemperature()
+ if debugFlag:
+ print("temperature = ", temp)
+ if(temp<target_temp and not minimum_always_ON):
+ setDutyCycle(0)
+ continue
+ if(temp<target_temp and minimum_always_ON):
+ setDutyCycle(minimum_speed)
+ continue
+ if(temp>=target_temp and temp<56):
+ setDutyCycle(40)
+ continue
+ if(temp>=56 and temp<60):
+ setDutyCycle(50)
+ continue
+ if(temp>=60 and temp<65):
+ setDutyCycle(60)
+ continue
+ if(temp>=65 and temp<70):
+ setDutyCycle(70)
+ continue
+ if(temp>=70 and temp<74):
+ setDutyCycle(80)
+ continue
+ if(temp>=74 and temp<76):
+ setDutyCycle(90)
+ continue
+ if(temp>=76):
+ setDutyCycle(100)
+ continue
+
+
+except KeyboardInterrupt: # trap a CTRL+C keyboard interrupt 
+ pwm_fan.close() # in case of unexpected exit, resets pin status (fan will go full speed after exiting)
+