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Image of the modification of the internal controller board to be able to to cold-junction compensation (large image if downloaded):
The white ISP connector closest to the red LED is not the standard one as I wanted a sixth pin (to the far right) that is hooked up to 3.3V so I have a target voltage reference for my UART interface. Never a good thing to drive UARTs on SoCs if the SoC itself is not powered.