Sign up for an Award
Participate with your entry in one of our professional or student awards.
Sign up for an awardLearn more:
Unsupported browser
You are using an outdated browser. Please upgrade your browser to improve your experience.
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
Zijingang Campus
Hangzhou, China
Zhejiang University
Zijingang Campus
Hangzhou, China
Zihao Gong;
Xingsuo Liu;
Yuan Tian;
Shaodong Zhang