No more noisy fans!

fancontrol.py

@@ -2,13 +2,16 @@
 
 import time
 
-from gpiozero import OutputDevice
-
+from gpiozero import PWMOutputDevice
 
+SLEEP_INTERVAL = 3  # (seconds) How often we check the core temperature.
 ON_THRESHOLD = 65  # (degrees Celsius) Fan kicks on at this temperature.
 OFF_THRESHOLD = 55  # (degress Celsius) Fan shuts off at this temperature.
-SLEEP_INTERVAL = 5  # (seconds) How often we check the core temperature.
-GPIO_PIN = 17  # Which GPIO pin you're using to control the fan.
+OUTPUTS = [0.5, 0.6, 0.7, 0.8, 0.9, 1]
+TEMPS = [40.0, 45.0, 50.0, 55.0, 60.0, 65.0]
+USE_PWM = True
+GPIO_PIN = 18 if USE_PWM else 17 # Which GPIO pin you're using to control the fan.
+
 
 
 def get_temp():
@@ -27,14 +30,32 @@ def get_temp():
     except (IndexError, ValueError,) as e:
         raise RuntimeError('Could not parse temperature output.') from e
 
+def get_speed():
+    """
+    Gets the temp of the board and assigns percentage of max max speed correspondingly
+    Returns: A value between 0-1. Can be configured by adjusting OUTPUTS and TEMPS.
+    """
+    speed = 0.0
+    for i in range(len(TEMPS)):  # loop through list of temps
+        if get_temp() > TEMPS[i]:
+            speed = OUTPUTS[i]  # set speed to the corresponding temp
+    return speed
+
+
 if __name__ == '__main__':
+
     # Validate the on and off thresholds
-    if OFF_THRESHOLD >= ON_THRESHOLD:
+    if not USE_PWM and OFF_THRESHOLD >= ON_THRESHOLD:
         raise RuntimeError('OFF_THRESHOLD must be less than ON_THRESHOLD')
 
-    fan = OutputDevice(GPIO_PIN)
+    fan = PWMOutputDevice(GPIO_PIN)
 
-    while True:
+    if USE_PWM:
+        while True:
+            fan.value = get_speed()
+
+            time.sleep(SLEEP_INTERVAL)
+    else:
         temp = get_temp()
 
         # Start the fan if the temperature has reached the limit and the fan
@@ -46,6 +67,4 @@ def get_temp():
         # Stop the fan if the fan is running and the temperature has dropped
         # to 10 degrees below the limit.
         elif fan.value and temp < OFF_THRESHOLD:
-            fan.off()
-
-        time.sleep(SLEEP_INTERVAL)
+            fan.off()