53 lines
1.7 KiB
Bash
53 lines
1.7 KiB
Bash
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#!/bin/bash
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# Inspired by https://github.com/kmwoley/unRAID-Tools/blob/master/unraid_array_fan.sh
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# User Defined variables
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FAN_LOW_PWM=30
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FAN_HIGH_PWM=255
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FAN_START_PWM=50 # technically 30 but setting higher to ensure fan is running
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LOW_TEMP=28
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HIGH_TEMP=60
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CPU_FAN=/sys/class/hwmon/hwmon3/pwm2
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# End of user defined variables
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NUM_STEPS=$((HIGH_TEMP - LOW_TEMP))
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PWM_INCREMENT=$(( (FAN_HIGH_PWM - FAN_LOW_PWM) / NUM_STEPS))
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OUTPUT+="Linear PWM Range is "$FAN_LOW_PWM" to "$FAN_HIGH_PWM" in "$NUM_STEPS" increments of "$PWM_INCREMENT$'\n'
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# Enable speed change on this fan if not already
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if [ "$CPU_FAN" != "1" ]; then
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echo 1 > "${CPU_FAN}_enable"
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fi
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PREVIOUS_SPEED=`cat $CPU_FAN`
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# TODO: Get from sensors
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CPU_TEMP=30
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if [ "$CPU_TEMP" -le "$LOW_TEMP" ]; then
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echo $FAN_LOW_PWM > $CPU_FAN
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OUTPUT+="Setting pwm to: "$FAN_LOW_PWM$'\n'
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elif [ "$CPU_TEMP" -ge "$HIGH_TEMP" ]; then
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echo $FAN_HIGH_PWM > $CPU_FAN
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OUTPUT+="Setting pwm to: "$FAN_HIGH_PWM$'\n'
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else
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# set fan to starting speed first to make sure it spins up then change it to low setting.
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if [ "$PREVIOUS_SPEED" -lt "$FAN_START_PWM" ]; then
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echo $FAN_START_PWM > $CPU_FAN
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sleep 4
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fi
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# Calculate target fan PWM speed as a linear value between FAN_HIGH_PWM and FAN_LOW_PWM
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FAN_LINEAR_PWM=$(( ((CPU_TEMP - LOW_TEMP) * PWM_INCREMENT) + FAN_LOW_PWM))
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echo $FAN_LINEAR_PWM > $CPU_FAN
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OUTPUT+="Setting pwm to: "$FAN_LINEAR_PWM$'\n'
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fi
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# produce output if the fan speed was changed
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CURRENT_SPEED=`cat $CPU_FAN`
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if [ "$PREVIOUS_SPEED" -ne "$CURRENT_SPEED" ]; then
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echo "Fan speed has changed."
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echo "${OUTPUT}"
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else
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echo "Fan speed unchanged. Highest temp: "$HIGHEST_TEMP" Current pwm: "$CURRENT_SPEED
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fi
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