Hi Flintstone,
I'll be releasing an LCDC plugin shortly which is able to extract info from INI files, environment variables, and the registry. I'm not familiar with Girder (I'll check it out), but I'm sure that the above plugin could be coaxed to do the trick. I'll let you know when I have a ...

I had the same idea a little while ago - it can be done, but I'm waiting for my LK204-25 to arrive before I can test it out. The circuit only needs 2 relays, and pretty much nothing in the way of baord design (I'm just using Veroboard).

The first relay switches between 5V and 12V, and the second ...