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The power-input leg of the DS3231 IC is disconnected from the board and soldered to a wire (purple) for connection to a digital pin on the Arduino. When powered by the VCC line on the module, the RTC is responsible for almost 50% of sleep current of the entire data logger. This technique requires advanced soldering skills but pin-powering the clock IC can reduce a data logger’s sleep current to ~0.1 mA, allowing for operation >2 years on 3 × 1.5 V AA cells in series.
