--update 2015-02-02I soldered another board yesterday and it fully worked on both channels. That means now I have more working PCB's then not working PCB's, so I feel confident enough to share the design. It's a bit of a clunky design and v2 will be a lot better, but also more complex (using ESP-12). If you are going with my blog posts and the components listed there, this should work quite well.
A word of warning though, I give no guarantee this will work in your case and that the design of this board is perfect. It certainly is not and the way the voltage converter is connected with little wires is beyond clunky... It works though, no problem!If you want to do me a favor, please buy it from here using the following link: http://dirtypcbs.com/view.php?share=3677&accesskey=68341995b44fe8081b778ea4761dae6a It will help me out a bit, and for you it just costs the normal very very low price of dirty PCB's anyway.
If you wish to get it somewhere else or modify it, You can download the fritzing file and gerber
files here so you can use it yourself.