adding @helno's GPIO fan control script.

image/fancontrol.py

@@ -0,0 +1,34 @@
+#!/usr/bin/python
+# @Author Ryan Dewsbury (helno)
+#
+# This script throttles a fan based on CPU temperature.
+#
+# It expects a fan that's externally powered, and uses GPIO pin 11 for control.
+
+import RPi.GPIO as GPIO
+import time
+import os
+
+# Return CPU temperature as float
+def getCPUtemp():
+	cTemp = os.popen('vcgencmd measure_temp').readline()
+	return float(cTemp.replace("temp=","").replace("'C\n",""))
+
+GPIO.setmode(GPIO.BOARD)
+GPIO.setup(11,GPIO.OUT)
+GPIO.setwarnings(False)
+p=GPIO.PWM(11,1000)
+PWM = 50
+
+while True:
+
+	CPU_temp = getCPUtemp()
+	if CPU_temp > 40.5:
+		PWM = min(max(PWM + 1, 0), 100)
+		p.start(PWM)
+	elif CPU_temp < 39.5:
+		PWM = min(max(PWM - 1, 0), 100)
+		p.start(PWM)
+	time.sleep(5)
+
+GPIO.cleanup()