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- #!/usr/bin/env python3
- import time
- from gpiozero import OutputDevice
- 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.
- def get_temp():
- """Get the core temperature.
- Read file from /sys to get CPU temp in temp in C *1000
- Returns:
- int: The core temperature in thousanths of degrees Celsius.
- """
- with open('/sys/class/thermal/thermal_zone0/temp') as f:
- temp_str = f.read()
- try:
- return int(temp_str) / 1000
- except (IndexError, ValueError,) as e:
- raise RuntimeError('Could not parse temperature output.') from e
- if __name__ == '__main__':
- # Validate the on and off thresholds
- if OFF_THRESHOLD >= ON_THRESHOLD:
- raise RuntimeError('OFF_THRESHOLD must be less than ON_THRESHOLD')
- fan = OutputDevice(GPIO_PIN)
- while True:
- temp = get_temp()
- # Start the fan if the temperature has reached the limit and the fan
- # isn't already running.
- # NOTE: `fan.value` returns 1 for "on" and 0 for "off"
- if temp > ON_THRESHOLD and not fan.value:
- fan.on()
- # 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)
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