RN314 Fan Speed

So I spent a few hours over the course of a few days working out how to update this script to support the RN314 model and here it is. Seems to be working pretty well on my unit.

follow exactly the same instructions as this thread:
viewtopic.php?f=11&t=76184

but in the fanoveride file, paste this code instead:

    #!/bin/bash

    ## Variables ##
    FANPWMPATH=/sys/devices/platform/it87.2560/pwm1
    FANSPEEDPATH=/sys/devices/platform/it87.2560/fan1_input
    CORETEMPPATH=/sys/devices/platform/coretemp.0/temp2_input
    MAXFAN=100   # Maximum operable speed
    MINFAN=0     # Minimum operable speed
    MINPWM=140   # PWM Limit
    MAXPWM=255   # PWM Limit
    MINTEMP=40000   # Min temp -> Fan slowest
    MAXTEMP=65000   # Max temp -> Fan fastest
    NEWSPEED=60  # Initial fan speed (%)

    ## Functions ##
    function getReadings {
        FANPWM=$(cat $FANPWMPATH)
        FANSPEED=$(cat $FANSPEEDPATH)
        CORETEMP=$(cat $CORETEMPPATH)
    }

    function setFanSpeed {
        if [ $NEWSPEED -lt $MINFAN ]; then
            NEWSPEED=$MINFAN
        fi
        if [ $NEWSPEED -gt $MAXFAN ]; then
            NEWSPEED=$MAXFAN
        fi
        NEWPWM=$(expr $MAXPWM - $MINPWM)
        NEWPWM=$(expr $NEWPWM \* $NEWSPEED)
        NEWPWM=$(expr $NEWPWM / 100)
        NEWPWM=$(expr $NEWPWM + $MINPWM)

        echo $NEWPWM > /sys/devices/platform/it87.2560/pwm1
       }

    function calcFanPercent {
        TEMPRAN=$(expr $MAXTEMP - $MINTEMP)
        TEMPREL=$(expr $CORETEMP - $MINTEMP)
        TEMPREL=$(expr $TEMPREL \* 100)
        TEMPPER=$(expr $TEMPREL / $TEMPRAN)
        NEWSPEED=$TEMPPER
    }

    ###################################################################
    echo "Automatically controlling fan speed..."
    while true
    do
        getReadings
        echo "Temp: $CORETEMP C    FAN: $NEWSPEED% [$FANSPEED RPM] [$FANPWM]"

        calcFanPercent
        setFanSpeed

        sleep 10
    done
    ###################################################################

Notes about the changes/variables:
- file paths had to be updated to support the different platform
- the MINTEMP and MAXTEMP values are x1000 as this is the value reported by the monitoring chip so 40c becomes 40000
- if you want your fan to spin at a higher minimum rate no matter what, edit the MINPWM value to something over 100 (100 is the default and lowest). As you can see I have set mine to 140
- You can set the NEWSPEED to 50 or higher however I have found it more effective to change the MINPWM value to set the fan speed floor
- the fanoveride log (/var/log/fanoveride.log) will show an incorrect fan speed percentage. Just ignore this. The key things to look at are the fan RPM and last number which is the current PWM value.


regarding automatic startup:
I don't think the script starts up automatically using the commands from the original post. If anyone knows how to fix this, please let me know.

Using this script, my HDDs which were now running at 49-50c are now at 43-44 and the fan never runs are the old ~700rpm