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What do you want to express, the green light of the sensor should be the power lamp constant, is there any problem.
Make a small PLC door on both sides of the beam switch, open the door after swiping the card, after the beam switch shoots into the object, enter the door opening program, when the object passes, count down N seconds, and drop the gate.
Either get the key to your house or get in through the window. >>>More
If you always feel that this dog will bring you a bad influence and affect your life, you should sell it and don't worry about it every day.
The general design is not brushed when going out, and there is generally a button on the side of the door when going out, and the door will open as long as you press it. >>>More
γγγIt's bad luck, I love you, you kick it away.