Add case fan script

casefan.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+# Inspired by https://github.com/kmwoley/unRAID-Tools/blob/master/unraid_array_fan.sh
+
+# User Defined variables
+FAN_LOW_PWM=90
+FAN_HIGH_PWM=255
+FAN_START_PWM=100 # technically 90 but setting higher to ensure fan is running
+LOW_TEMP=30
+HIGH_TEMP=60
+FRONT_FAN=/sys/class/hwmon/hwmon3/pwm3
+REAR_FAN=/sys/class/hwmon/hwmon3/pwm4
+
+# End of user defined variables
+NUM_STEPS=$((HIGH_TEMP - LOW_TEMP))
+PWM_INCREMENT=$(( (FAN_HIGH_PWM - FAN_LOW_PWM) / NUM_STEPS))
+OUTPUT+="Linear PWM Range is "$FAN_LOW_PWM" to "$FAN_HIGH_PWM" in "$NUM_STEPS" increments of "$PWM_INCREMENT$'\n'
+
+# Enable speed change on this fan if not already
+if [ "$FRONT_FAN" != "1" ]; then
+  echo 1 > "${FRONT_FAN}_enable"
+fi
+
+if [ "$REAR_FAN" != "1" ]; then
+  echo 1 > "${REAR_FAN}_enable"
+fi
+
+PREVIOUS_SPEED=`cat $FRONT_FAN`
+MOTHERBOARD_TEMP=`sensors acpitz-acpi-0 | grep "MB Temp" | grep -o '[0-9]*' | head -1`
+
+echo "MB Temp: "$MOTHERBOARD_TEMP""
+
+if [ "$MOTHERBOARD_TEMP" -le "$LOW_TEMP" ]; then 
+  echo $FAN_LOW_PWM  > $FRONT_FAN
+  echo $FAN_LOW_PWM  > $REAR_FAN
+  OUTPUT+="Setting pwm to: "$FAN_LOW_PWM$'\n'
+elif [ "$MOTHERBOARD_TEMP" -ge "$HIGH_TEMP" ]; then
+  echo $FAN_HIGH_PWM  > $FRONT_FAN
+  echo $FAN_HIGH_PWM  > $REAR_FAN
+  OUTPUT+="Setting pwm to: "$FAN_HIGH_PWM$'\n'
+else
+  # set fan to starting speed first to make sure it spins up then change it to low setting.
+  if [ "$PREVIOUS_SPEED" -lt "$FAN_START_PWM" ]; then
+    echo $FAN_START_PWM > $FRONT_FAN
+    echo $FAN_START_PWM > $REAR_FAN
+      sleep 4
+  fi
+
+  # Calculate target fan PWM speed as a linear value between FAN_HIGH_PWM and FAN_LOW_PWM
+  FAN_LINEAR_PWM=$(( ((MOTHERBOARD_TEMP - LOW_TEMP) * PWM_INCREMENT) + FAN_LOW_PWM))
+  echo $FAN_LINEAR_PWM > $FRONT_FAN
+  echo $FAN_LINEAR_PWM > $REAR_FAN
+  OUTPUT+="Setting pwm to: "$FAN_LINEAR_PWM$'\n'
+fi
+
+# produce output if the fan speed was changed
+CURRENT_SPEED=`cat $REAR_FAN`
+if [ "$PREVIOUS_SPEED" -ne "$CURRENT_SPEED" ]; then
+  echo "Fan speed has changed to PWM: "$CURRENT_SPEED" MB temp: "$MOTHERBOARD_TEMP""
+  echo "${OUTPUT}"
+else
+  echo "Fan speed unchanged. MB temp: "$MOTHERBOARD_TEMP" PWM: "$CURRENT_SPEED""
+fi