Cellular Serial Link between Microcontrollers

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2014
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Swarthmore College. Dept. of Engineering
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Thesis (B.A.)
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Full copyright to this work is retained by the student author. It may only be used for non-commercial, research, and educational purposes. All other uses are restricted.
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Abstract
This project creates a serial data link using a voice call between cell phones. This is done via the creation of a simple modem that uses On-Off Keying (OOK) as the modulation scheme, and an (8, 12) Hamming code for error correction. Input and output (Tx / Rx) serial signals from a local device are modulated into an audio signal; the audio is sent over the cellular network to a remote device. Serial signals can go both ways, allowing for both remote automation and remote data collection. Any microcontroller can call any number of other microcontrollers within this system; the only limit to connection is the establishment of a voice call between cell phones. The purpose of this data link is to allow for low-cost, mobile, serial communication between microcontroller projects, without limitations on geographic distance.
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