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Open Modem Firmware

Open Modem Firmware is an open source firmware implementation of a AFSK modem supporting 300, 1200 and 2400 baud operation, suitable for communication over a wide variety of analogue mediums, both radio and wired. The firmware is designed for and compatible with unsigned.io's OpenModem, but can be used on any similar build.

Complete modems are available from the unsigned.io shop, or can be build from scratch by referring to the schematics and documentation on the OpenModem page

A few highlights


Please refer to the manual and instructions posted at the OpenModem page. The default serial connection settings are 115200 baud, 8N1. For configuring the modem, please see the OpenModem Config Utility.

Support OpenModem Development

You can help support the continued development of open, free and private communications systems by donating via one of the following channels:

Site mirrored on 04DEC2023
Original site


Unless otherwise noted, everything here is put into the world under a CC BY-NC-SA 4.0 license.
Feel free to share and remix, just remember the attribution.