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