Above: The height of the compost pile dropped about a foot in a week of cooking. The temperature probes dropped less so they extend farther above the pile. This changed the relationship between the sensors and the center of the pile.
I left the Riffle in the compost pile for 5.5 additional days unattended and it logged every five minutes. That is a total of one week of logging without recharging the battery. I would have continued the logging, but the compost is now spread around the garden.
Above: The temperature of the pile stayed high all week. The highest temperature reached was 69°C (156°F) on the third day. It's too bad the garden needed the compost because the pile would have cooked for a few more days.
The sketch running on the Riffle is attached to the previous note. It is based on Kina's original sketch with the buggy SD library.