The tweaks I discuss in the  power optimization post bring sleep current on a typical build into the 0.1-0.12mA range; leaving the sleeping μSD cards  as the largest remaining power consumer on the Cave Pearl loggers.   And those cards have been a burr under my saddle for quite some time now, as they are probably responsible for most (if not all..) of the power consumption irregularities that were showing up in some … Continue reading Cutting Power to Secure Digital Media cards for Low Current Data Logging