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In order to make the cover generate warning signals when it leaves the fixed frame, we take the cover and the fixed edge as a contacted switch and if the cover doesn’t leave the fixed edge, the switch will not be started, or it will be started. Then how to send out the early warning signal, starting from the fixed edge frame. Usually the material of the edge frame is metal, we reconstruct it to red led blinking lights. Once the switch is started, led blinking lights will be bright and send out warning sound. It can play a part of warning no matter in the day and night and under conditions of water logging.
South China Agricultural University
Guangdong guangzhou, China