⬢github · 63 ★ +56 since we first saw it · pushed 5 d ago · CERN-OHL-P-2.0
Koppar-AI/koppar-lte-modem
A phone line over USB-C: LTE data, SMS and voice calls with the call audio on USB. A 4-layer KiCad board designed by Koppar from a one-page spec.
An open-hardware KiCad board that turns a computer into a phone via USB-C: a Quectel EC25 LTE module provides data, SMS and voice calls over AT commands, while an RP2040 bridges the module's PCM audio as a USB sound card. One USB cable and a nano-SIM give a machine its own phone line, with full Gerbers and JLCPCB assembly files included.
Why now: Recently Show HN'd ('A USB-C LTE modem that gives my computer a phone line'), and notably designed by Koppar AI from a one-page spec, attracting attention for AI-agent-controllable telephony.
Who it is for: Hardware hobbyists and developers who want their computer or AI agent to make calls, send texts, or use LTE data.
ec25kicadlteopen-hardwarepcbquectelrp2040smsusb-cvoip
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