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In-Depth: Interface DS3231 Precision RTC Module with Arduino
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DS3231 Precision RTC FeatherWing - RTC Add-on For Feather Boards : ID 3028 : $13.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Fermion: DS3231 Precision RTC Breakout for Arduino - DFRobot
