relay.py 文件源码

def test_relay():
   """Test relay on and off cycle"""

   # check if the output is high
   print 'current control output is: ', is_output_high(), ' (should be off)'

   # start the relay
   start_relay()

   print 'current control output is: ', is_output_high(), ' (should be on)'

   # setup a timer to stop the relay after 5 seconds
   t = Timer(5, stop_relay)
   t.start()

   # wait for the timer to finish
   t.join()