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Some disaster make electric power failure, how can we know the right direction to escape?
Each time we open the door, the door knob transform the moving energy to electric, when the power cut,
the door knob will light on, and we can easy to find where is the export, it also become a portable flash light,
you can take it to escape.
Southern Taiwan University of Science and Technology
YongKang City, Taiwan
Southern Taiwan University
Xinying City, Tainan County, Taiwan
Jia-Cheng Chang Chih-Chia Kuo Chia-Yin Liao Ching-Yi Chen Hao-Kai Chen Wei-Chu Lin