Introduction - If you have any usage issues, please Google them yourself
Each floor of the elevator is equipped with a switch of up and down, and the elevator has a digital switch with passengers arriving at the level. The current floor location of the elevator is displayed by a digital tube, which displays the opening/closing state with a light-emitting diode, which displays the upper and lower request state of each layer with the light-emitting diode.
Show the current position of the elevator and the ascending descending and opening of the elevator;
Lift a ladder every two seconds;
After the elevator reaches the floor at the request of the stop, the door will automatically open the door indicator, and after 5 seconds, the elevator door will be closed automatically (the door indicator will be off) and the elevator will continue to operate.
The opening time of the elevator can be extended. The opening can be extended for 5 seconds each time. It can be used continuously, or it can be closed in advance (press the close button).
Can all the request signal memory inside and outside the elevator, and in accordance with the rules of elevator running time response, each request to retain the signals to perform after removal, such as arriving at a layer, the below are no request, the elevator stopped at the layer, a halt.
The question is: figure out what the state machine is.
I would appreciate it if I could have an example
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