Just hammered out revision .01 of the firmware for this controller.  There will be an update to the hardware design files as well once I have time to add in at least a couple of inputs (on/off and autotune), and possibly an LED output.  This firmware is currently untested as I am waiting for the components to show up to actually build the circuit.  Next step will be to etch a prototype PCB once I finish tweaking the design file.  This will be my first attempt at etching PCBs, so that should be an adventure in and of itself :)