Cardboard timing belt ?!!??? That's genius !!!
Chapeau Bas !
Literary Clock Made From E-reader
3 arduinos :O, that's an overkill ^^
Paper Mache Bluetooth Speaker
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How to Create Custom Character for LCD
really nice ! it think you could even combine this instructable with this one : https://www.instructables.com/13-Ideas-for-Diffusing-LEDs/ if you want a nicer light diffusion !
4-Digit 7-Segment Display From Trash
Delta Bot: DIY 3D Printer
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Grocery Bag Sunglasses
Professional Video and Audio for Podcasting
It's like a straw. If you filled it with a liquid and you plug an end, the liquid won't come out of the other end ! I think the pen will work as long as there is ink on the ball. But eventually the ink will stop flowing to the tip of the pen and then it won't work anymore.
You do realise the pen won't work anymore, right ?
sound intensity is a logarithmic function, it might be a good idea to take that into concideration when you're choosing your thresholds. Nice project though !
A Universal RFID Key
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3D Digital Sand
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DIY 3D Printer: How to Make a 3D Printer That Anyone Can Do
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How to Make a Clap-Clap on / Clap-Clap Off Switch Circuit!
''Magic Button'' Remote Switch