GitHub - fregacmols/RotaryCell: A portable, battery-powered cellular conversion for classic rotary telephones—fully reversible, with no modification to the original phone.

▤ Summary

This repository documents RotaryCell, a project that converts a classic rotary phone into a portable cellular phone without altering the original device. The archive includes firmware, wiring references, PCB files, and assembly guidance for both a hand-wired prototype and newer board revisions. The project supports rotary dialing, switch-hook detection, incoming and outgoing calls, bell ringing, audio conditioning, battery monitoring, diagnostics, and OTA updates. It also emphasizes reversibility, prototype validation status, and safety constraints around lithium batteries and telephone-network isolation.

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