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A typical breadboard testing setup to assess sleep current and verify code operation prior to soldering. The configuration shown includes a no-name clone of the Sparkfun Pro-Mini, a Macetech Chronodot DS3231 RTC, a stand-alone AT24C512 EEPROM module, a KEYES 5050 LED module and an Adafruit micro SD card adapter. Typical sleep currents at 3.3 V for the main components are: DS3231 module (0.08–0.09 mA), Sleeping micro SD card (0.05–0.09 mA), Pro Mini style board (0.02–0.06 mA).
