Simon @ Scitoys shows you how to build a computer controlled wireless transmitter - "How would you like to send text messages to your friends without wires, and without an Internet connection, and without paying monthly fees? In this project we will build a very simple radio transmitter that you attach to a serial port on your computer. The computer then runs a free program that converts words you type into radio signals that are decoded by another computer, using a cheap radio receiver, and a sound card. " - Link.
Related:
- Video: Morse coders beating SMSers - Link.
- DIY Morse code Palm keyboard interface board - Link.
- Make Morse Code Music - Link.
- Simple Working Telegraph System - Link.
- -- --- .-. ... . -... . .- - ... ... -- ... - Link.
http://blog.makezine.com/archive/2006/08/how_to_build_a_computer_c.html