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Arabell300 is an old school modem, Bell 103 and ITU V.21 compatible, working at 300 baud. It is build entirely around Arduino Nano, featuring an Atmel AVR ATmega328P microcontroller, programmed using Arduino IDE.

The project started as proof-of-concept, the author was just curious to see how much power resides in the tiny 8-bit microcontroller, how minimal DSP functions could be implemented, how a basic AT-style dialog works and, of course, to see if it can really connect to real modems using some VoIP poviders. Well, it works... almost.