Fig. 6
From: An open-source platform for sub-\(\textrm{g}\), sub-\(\upmu\)A data loggers
Base for tags. The tag base provides a USB interface between a host computer and tag. The tag is supported physically by a 3D printed base that can be modified for new tag designs. The base provides a battery charger that is configured with load resistors and an interface to an external power supply/current monitor. The base is isolated from the tag with low-leakage analog switches