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--- raspberry-pi-4b [2020/01/05 16:12] – [FAN PWM Noctua NF-A4x10 5V] blazek
+++ raspberry-pi-4b [2020/01/05 16:17] – [FAN PWM Noctua NF-A4x10 5V] blazek
@@ Řádek 20: / Řádek 20: @@
     * https://www.tme.eu/cz/details/1w-10k-1%25/metalizovane-rezistory-tht-1w/royal-ohm/mf01sff1002a10/
-{{::rpi4b-fan-regulator-01.jpg?400|}}
+{{::rpi4b-fan-regulator-01.jpg?450|}}
-{{::rpi4b-fan-regulator-02.jpg?400|}}
+{{::rpi4b-fan-regulator-02.jpg?450|}}
+{{::pwm_driver_stripboard.png?450|}}
+**Specific fan speed and temperature breakpoints for Noctua NF-A4x10 5V**
+<file bash fan-noctua.sh>
+#!/bin/bash
+# Device references
+dev_temp=/sys/class/thermal/thermal_zone0/temp
+dev_pwm=/sys/class/pwm/pwmchip0/pwm0
+dev_enable=$dev_pwm/enable
+dev_duty=$dev_pwm/duty_cycle
+dev_period=$dev_pwm/period
+# Export pwm0 if it's not available
+if [ ! -e $dev_pwm ]; then
+    echo 0 > /sys/class/pwm/pwmchip0/export
+    sleep 2
+fi
+# PWM frequency (nanoseconds)
+period=1000000
+# temperature breakpoints (millidegrees)
+off_low=45000
+low_off=40000
+low_high=52000
+high_low=48000
+# fan-speed (nanoseconds)
+low=930000
+high=999999
+# on/off values
+off=0
+on=1
+# update interval (seconds)
+interval=10
+# initialise the fan
+next=($off $low)
+echo $period > $dev_period
+echo ${next[0]} > $dev_enable
+echo ${next[1]} > $dev_duty
+update_status() {
+    if [[ $(cat $dev_enable) == 1 ]]; then
+        if [[ $(cat $dev_duty) == $high ]]; then
+            nvalue=3
+            svalue="High"
+        else
+            nvalue=2
+            svalue="Low"
+        fi
+    else
+        nvalue=1
+        svalue="Off"
+    fi
+    logger "Fan $svalue"
+}
+while [ : ]
+do
+    temp=$(cat $dev_temp)
+    current=($(cat $dev_enable) $(cat $dev_duty))
+    if [ $temp -gt $off_low ]; then
+        next[0]=$on
+        if [ $temp -gt $low_high ]; then
+            next[1]=$high
+        elif [ $temp -lt $high_low ]; then
+            next[1]=$low
+        fi
+    elif [ $temp -lt $low_off ]; then
+        next[0]=$off
+    fi
+    if [ "${next[*]}" != "${current[*]}" ]; then
+        echo ${next[1]} > $dev_duty
+        echo ${next[0]} > $dev_enable
+        update_status
+    fi
+    sleep $interval
+done
+</file>
 ===== FAN PWM =====