ERICSL
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ERICSL reacted to mar0ni in PWM Fan on Nanopi M4 ??Slightly improved and simplified script (still room for improvement, I guess).
#!/bin/bash if [ ! -d /sys/class/pwm/pwmchip1/pwm0 ]; then echo 0 > /sys/class/pwm/pwmchip1/export fi sleep 1 while [ ! -d /sys/class/pwm/pwmchip1/pwm0 ]; do sleep 1 done ISENABLE=`cat /sys/class/pwm/pwmchip1/pwm0/enable` if [ $ISENABLE -eq 1 ]; then echo 0 > /sys/class/pwm/pwmchip1/pwm0/enable fi echo 50000 > /sys/class/pwm/pwmchip1/pwm0/period echo 1 > /sys/class/pwm/pwmchip1/pwm0/enable # max speed run 5s echo 0 > /sys/class/pwm/pwmchip1/pwm0/duty_cycle sleep 5 echo 49994 > /sys/class/pwm/pwmchip1/pwm0/duty_cycle declare -a CpuTemps=(75000 63000 58000 52000 48000 0) declare -a PwmDutyCycles=(25000 37000 48300 49250 49300 49994) while true do temp=$(cat /sys/class/thermal/thermal_zone0/temp) for i in 0 1 2 3 4 5; do if [ $temp -gt ${CpuTemps[$i]} ]; then DUTY=${PwmDutyCycles[$i]} echo $DUTY > "/sys/class/pwm/pwmchip1/pwm0/duty_cycle"; #echo "temp: $temp, target: ${CpuTemps[$i]}, duty: $DUTY" break fi done sleep 2s; done
