fans

#!/bin/bash
SMC=/sys/devices/platform/applesmc.768

TEMPMAX=90
TEMPMIN=45

FANMAX=6200
FANMIN=2000

C1=$(( $FANMAX - $FANMIN ))
C2=$(( $TEMPMAX - $TEMPMIN ))
CF=$(( $C1 / $C2 ))

TM=$(( $CF * $TEMPMAX - $FANMAX  ))
#echo CF=$CF
#echo TM=$TM

echo 0 > $SMC/fan1_manual
echo 0 > $SMC/fan2_manual



while :
do
CORETEMP1=$(( `cat /sys/devices/platform/coretemp.0/temp1_input` / 1000 ))
CORETEMP2=$(( `cat /sys/devices/platform/coretemp.1/temp1_input` / 1000 ))
TEMP=$(( ($CORETEMP1 + $CORETEMP2) / 2 ))
#echo TEMP1=$CORETEMP1
#echo TEMP2=$CORETEMP2
#echo TEMP=$TEMP
SET=$(( $CF * $TEMP - $TM ))
#echo FAN=$SET
echo $SET > $SMC/fan1_min
echo $SET > $SMC/fan2_min
sleep 2
done