The pcb design is not a real big deal. I draw my circuits in eagle 6.6 the free trial version is available on there website.
But i though you don't want that, because people would have to solder there own circuit board.
The discussion about the two rs485 lines I believe that is my fault. I want those lines because that i need my controller to communicate with other heating controllers on my place. I placed the two lines on the arduino using the software serial library by this way you can make extra serial lines.
An lcd display is very handy to simply look what kind of temperatures your running without the use of computer. If you want to create a controller that will be handy for everybody you should really keep the display on the project.
stef
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