Bottle Holder
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This bottle holder uses a button to control an LED light. When a bottle is placed in the holder, the light turns off. Remove the bottle, and the light switches on, reminding you to put it back.
Supplies
1 a piece of card board
2 a bottle
3 a few Arduino wires
4 a Arduino LED light
5 some tapes
6 a scissor
Folding the Holder

Fold the cardboard into a rectangle box with a empty interior
Folding the Holder

fold a square box with empty interior for the base with the cardboard
Folding the Holder

tape those two together
Making the Hole

poke a hole in the square base bottom and stick the button in