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When using public toilets,how do you know if there are vacancies？
And how do you choose the right room to wait for？The efficient toilet solves these problems for users. This design provides apparent signals for people who are waiting by combining the connection and disconnection of the circuitry with the use
conditions of the toilet. When there is a vacany,the signal line is straight. When there is a vacany,the line is cut and takes on a 45
degree angle. When there is a long time to wait, the line will take
on a 90 degree angle. The doorknob and the signal line make up a coordinated control system. The line signal also works.
Yue Liu Tinghua Lu