This is the board after etching (The picture is blurry, not the PCB
). As an aside, this was my absolute first ever try at toner transfer PCB production, and I'm amazed at how easy it is and how high the quality of the result is. I'll definitely be making many more PCB's using this method.
And here it is after drilling and soldering the components:
Finally, this is what it looks like in action, along with the display, a small keypad I whipped up, and a voltage regulator circuit:
So go ahead and try it yourself. With a pot meter connected instead of the keypad, this should work with Jeff's firmware (with the caveat that you have to make the change in pin assignment I described earlier). I have NOT tested this though.