Let me introduce you to my new project.
I bought quite a while ago a lavalier mic (rode lavalier). I've been using it directly plugged to my dslr mic input. As you may guess, this is a pain in the neck because I have to fiddle with meters of cable.
For a while, I was thinking about buying a second-hand audio recorder (e.g. zoom h1 or tascam dr-05), or a wireless mic solution. At some point, I realised that nobody has yet released an open source digital audio recorder. I took that as a challenge.
So here I am : I have not enough experience to build this and a huuuge goal. We'll see if it works, hopefully :)