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DS1307 RTC I2C Module
Overview | DS1307 Real Time Clock Breakout Board Kit | Adafruit Learning System
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DS1307 RTC Module I2C Real Time clock with Battery Backup
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Adafruit DS1307 Real Time Clock Assembled Breakout Board : ID 3296 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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batteries - Why put a voltage divider between a battery and the battery pin of an RTC? - Electrical Engineering Stack Exchange
Grove - DS1307 RTC (Real Time Clock) for Arduino | Seeed Studio Wiki
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SparkFun Real Time Clock Module - BOB-12708 - SparkFun Electronics
RTC module DS1307 – Microscale
Arduino - DS1307 RTC Module | Arduino Tutorial
