Added fan control script used for Geekworm XC-1 derivatives e.g. NASPi/Gemini, should be usable with any PWM/GPIO controlled fan

fanctl.py

@@ -0,0 +1,42 @@
+#!/usr/bin/python3
+
+import RPi.GPIO as IO
+import time
+import subprocess
+
+servo = 18
+
+IO.setwarnings(False)
+IO.setmode (IO.BCM)
+IO.setup(servo,IO.OUT)
+fan = IO.PWM(servo,2000)
+fan.start(0)
+
+def get_temp():
+    output = subprocess.run(['/opt/vc/bin/vcgencmd', 'measure_temp'], capture_output=True)
+    temp_str = output.stdout.decode()
+    try:
+        return float(temp_str.split('=')[1].split('\'')[0])
+    except (IndexError, ValueError):
+        raise RuntimeError('Could not get temperature')
+
+def set_speed(fan, speed):
+    fan.ChangeDutyCycle(speed)
+
+while 1:
+    temp = get_temp()                   # Get the current CPU temperature
+    if temp > 70:                       # Check temperature threshhold, in degrees celcius
+        set_speed(fan, 100)             # Set fan duty based on temperature, 100 is max speed and 0 is min speed or off.
+    elif temp > 60:
+        set_speed(fan, 85)
+    elif temp > 50:
+        set_speed(fan, 60)
+    elif temp > 40:
+        set_speed(fan, 50)
+    elif temp > 32:
+        set_speed(fan, 45)
+    elif temp > 25:
+        set_speed(fan, 40)
+    else:
+        set_speed(fan, 0)
+    time.sleep(5)                       # Sleep for 5 seconds