Concept Ring with compartment for Electronics
thingiverse
A CAD drawing showcases a concept ring design with a screw-on top featuring an LED hole and a mini-USB side opening. The top has a cavity for increased payload space, fitting onto a 2-liter pop bottle like a cap. This OpenSCAD creation is untested but serves as a proof of concept to save others' time. Consider using a small Arduino-based electronics package and a coin cell battery. The recessed top can be grooved for easy battery replacement with a coin, while the mechanical wiring for the connector requires further consideration.
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