Fig. 8
From: An open-source platform for sub-\(\textrm{g}\), sub-\(\upmu\)A data loggers
Tag breakout board (left), daughter card (center), and sensors (right). The tag breakout board (left) provides all of the functionality of a tag baseboard along with the processor and RTC used in a tag. All of the processor’s free pins are brought to connectors enabling the creation of accurate tag prototypes with suitable daughter cards. In this figure, a daughter card (middle) with an external flash and connector is illustrated along with both a commercial sensor board (upper right) and a custom sensor board (lower right)