Looks like I have to resort to psychological blackmail then<P>"An spectrum analyser for an IpaQ pocketPC using the built in mic would be awesome, but it's probably <B>impossible</B>. I bet it can ...

This project uses two Arduino to communicate with each other using light by means of Morse Code. As a more advanced project, it has some complex array usage and investigates converting switch inputs ...

When the first radios and telegraph lines were put into service, essentially the only way to communicate was to use Morse code. The first transmitters had extremely inefficient designs by today ...