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It is an improved design which adds a circle LED under manhole cover. It is used to remind passers-by that it is dangerous when the cover is lost. The pressure sensor under LED can detect pressure. When pressure decrease, the LED is activated.
Zhejiang University
Hangzhou, China
Zhejiang University
Hangzhou, China
Zihao Gong;
Xingsuo Liu;
Yuan Tian;
Shaodong Zhang
