PyCNC

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import threading
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import time
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from cnc import hal
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class HardwareWatchdog(threading.Thread):
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    def __init__(self):
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        """ Run feed loop for hardware watchdog.
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        """
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        super(HardwareWatchdog, self).__init__()
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        self.setDaemon(True)
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        self.start()
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    def run(self):
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        while True:
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            hal.watchdog_feed()
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            time.sleep(3)
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# for test purpose
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if __name__ == "__main__":
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    hal.init()
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    hal.fan_control(True)
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    print("Fan is on, it should turn off automatically in ~15 seconds."
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          "\nExiting...")
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