enable_fan.py

import os 
import imp
import sys
import datetime

pathPWM = "/sys/class/hwmon/hwmon0/pwm1"
pathTEMP = "/sys/class/thermal/thermal_zone0/temp"
pathLOG = "fan.log"
tempMax = 70
tempMin = 35 


def getTemp():
    with  open(pathTEMP, "r") as f:
        temp = int(f.read().replace('\n',''))
        return temp
def getPWM(p=pathPWM):
    with open(p,'r') as f: 
        return f.readlines()[0].replace('\n','')

def logNow(): 
    with open(pathLOG,'a') as f: 
        f.write("\n temp: "+str(getTemp())+ " fanPWM: "+str(getPWM())+" date: "+ str(datetime.datetime.now()) )
def tempToPWM(t=getTemp()/1000,mi=tempMin,ma=tempMax,maxPWM=255):
    if t>ma: 
        return maxPWM
    elif t<mi: 
        return 0
    else:
        return ((t/mi)-1)*maxPWM
def percentToPWM(p):
    return round(255/100*p)

def writeFanPWM(pwm):
    with open(pathPWM, "w") as f: 
        f.write(str(150))

    if pwm > 255 or pwm < 0:
        raise ValueError('only values in range 0-255 allowed')
    else: 
        with open(pathPWM, "w") as f: 
            if pwm < 60 and pwm>0:
                f.write(str(60)) 
                print("set fan to "+str(round(60/255.0*100))+"%")
            else:
                f.write(str(pwm))
                print("set fan to "+str(round(pwm/255.0*100))+"%")
            print( "temperature at "+ str(getTemp()/1000)+" C")


if __name__ == "__main__": 
    writeFanPWM(tempToPWM())
    #adjustTemp()
    #print(sys.argv)
    if  len(sys.argv) > 1:
        if sys.argv[1] == 'force': 
            print("Reason: user specified")
            writeFanPWM(percentToPWM(int(sys.argv[2])))

    logNow()