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The button of tap is actually full of bacteria, if you press the button after you washed your hand, your hand is still not clean.
Based on this problem, what if there is a round disc shape sensor on the button of tap, water will be cooler when you move your hand counterclockwise, on the contrary, water will be hotter when you move you hand clockwise. You can adjust the temperature of water and dont have to touch the tap.
National Cheng Kung University