Finished and published initial version of 2 'building instructions' for the procedure I recommend for assembling the board. You certainly don't have to follow this approach, but it's how I've been building mine, and is the safest way to prevent you from blowing up the expensive processor.
Also, I made a minor update to the PCB, now labelled version 3.1C (previous version was 3.0C).
It's just a 1-wire addition for adding a second pin to receive the RTC clock signal. I wanted to have a separate timer fed by the RTC clock so I could have a good 'seconds' counter and not have to keep resetting the real RTC clock. AS I would like to at some point have a battery-backed-up RTC clock circuit so that the oven can retain a real time clock for however long the standard CR2022 or whatever battery can last!
But currently there is no battery backup, so for now it will still lose real clock settings once you turn off power.
** Note: ** you do NOT have to do this mod if you already built this PCB, and don't feel like doing it. I will provide a compile switch as well as two production '.hex' files:
1) WITH the second RTC clock enabled (if you did the mod or built the latest 3.1 PCB)
2) WITHOUT the second RTC clock
I should have reflow running soon, I am working on this particular GUI's now and working the the graph display for it all..