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Introduction

My aim here is to create a fun project which does wireless peer to peer communication using audio signals.

*Sound waves (free to use) will be used instead of radio waves (licensed/restricted) as we can tinker freely
*This projects expects that you are already familiar with the OSI model and has some basic computer networking knowledge.

Regarding License
In order to ensure that the project remains completely free and unencumbered by anyone's copyright monopoly, it is advisable that you as a major contributor, explicitly dedicate your code-base contributions to the public domain. If you are contributing code to this project outside of "The Unlicense" license, please ensure that the license details are also brought in.

Table of contents

• Physical Layer in practise

1. Sound vs Radio waves?
2. Basic terminologies
3. The science of 1's and 0's
4. Need for Preamble and Syncword
5. Sending and receiving a bit
6. Sending the payload and receiving it?
7. Energy consumption considerations
8. Amplitude shift keying vs Frequency Shift Keying (FSK)
9. Channel usage considerations; Channel hopping / Frequency hopping (FH)