Since I’m on a student budget, I couldn’t afford to leave an actual Arduino into my projects, so I designed, etched and assembled the BareDuino classic. I can quickly throw one into a project without having to worry about using an expensive regular Arduino.
Using the experience I earned from the original BareDuino, I started the BareDuino Nano project at the age of 13. I saw Fabio Varesano’s Femtoduino and really liked the idea, so I set myself the challenge of making it even smaller. Needless to say I’ve succeeded. In order to make it smaller, I had to use 0402 resistors and capacitors (which were a pain to hand-solder) and use 1.27mm spaced headers.
Because I was working with such small components, I had to use solderpaste and a soldering oven to get it right. For assembling earlier revisions, I tried to apply the solderpaste by hand but it just wouldn’t work well enough/at all. Eventually I went over to a nearby FabLab and laser-cut some stencils for applying the solder paste.
I didn't build this to get credit, but because I love challenges. I finished a working prototype within half a year, and the challenge was gone. It was only 2 years later that I picked it up again and decided to try and get it in production.
Just saying.
Yes, doing things yourself is very commendable and respectable. However, if the goal was cost, somehow $19 is a bit ridiculous.