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The smart pen can notice that ink of pen is almost run out, and then it is time to change another pen.
Another color of ink was infused into top of pen refill, this ink is lighter than originals and cant mix, so when writing color begin change to mean that ink is almost run out, it is time to change new pen or ink of pen.
National Cheng Kung University
Tainan City, Taiwan
National Cheng Kung University
Tainan City, Taiwan
Ming-Hsien Lin
Far East University
Tainan City, Taiwan
Li-Ju,Wang