{"title":"Adafruit DS1307 Real Time Clock Assembled Breakout Board","handle":"adafruit-ds1307-real-time-clock-assembled-breakout-board","url":"/products/adafruit-ds1307-real-time-clock-assembled-breakout-board","description":"The Adafruit DS1307 Real Time Clock breakout keeps accurate time even when your microcontroller loses power or is reprogrammed. This battery-backed I2C RTC is one of the most widely used clock chips, making it a reliable choice for datalogging, alarms, timers, and clock projects.\n\nThe DS1307 requires 5V power but has been successfully used with 3.3V logic levels. It comes fully assembled with headers, ready to plug into a breadboard. A CR1220 coin cell battery (not included) provides backup power for 5+ years of timekeeping.\n\nKey Features\n\n\nBattery-Backed Timekeeping – Maintains time through power loss and reprogramming\n\nI2C Interface – Simple two-wire communication\n\n5+ Year Battery Life – With CR1220 coin cell (not included)\n\nFully Assembled – PCB and headers included, breadboard-ready\n\nTwo Mounting Holes – For permanent installations\n\n\nAlso Available\n\n\nDS3231 Precision RTC – Temperature-compensated, ±2 ppm accuracy\n\nPCF8523 RTC – 3.3V compatible, affordable alternative\n\n\nIdeal For\n\nDatalogging with timestamps\nClock and alarm projects\nScheduled automation and timers\nAny project needing persistent timekeeping\n\n\nPackage Contents\n\n1× DS1307 RTC breakout board (fully assembled with headers)\n\n\n\nNote: CR1220 coin cell battery not included. The DS1307 requires 5V power. It may lose or gain up to 2 seconds per day — for higher precision, consider the DS3231.\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":12450,"title":"Default Title","sku":"AF-3296","price":14.63,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":101,"option1":"Default Title"}]}