The Adafruit DS1307 Real-Time Clock Breakout keeps track of time even when your microcontroller loses power, with battery backup, 5V operation and support for Arduino, CircuitPython and Raspberry Pi. CR1220 battery not included.
This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. The DS1307 is the most popular RTC - but it requires 5V power to work (although we've used it with 5V power and 3.3V logic successfully).
Works great with an Arduino using Adafruit's RTC library or with a Raspberry Pi (or similar single board linux computer)
Please note: This product does not come with a CR1220 coin cell battery. We recommend you purchase a coin cell battery to use with this product.
The DS1307 is simple and inexpensive but not a high precision device. It may lose or gain up to 2 seconds a day. For a high-precision, temperature compensated alternative, please check out the DS3231 precision RTC. If you do not need a DS1307, or you need a 3.3V-power/logic capable RTC please check out our affordable PCF8523 RTC breakout.
Features
Battery-backed real time clock (RTC) module with DS1307 chip
Maintains accurate time during power loss or microcontroller reprogramming
Ideal for datalogging, clock-building, time stamping, timers and alarms
Requires 5V power supply
Compatible with Arduino, CircuitPython, Raspberry Pi and Linux single board computers
Works with Adafruit's RTC library
Accuracy: may lose or gain up to 2 seconds per day
Coin cell battery (CR1220) not included
Simple and inexpensive RTC solution
Specifications
Length: 25.8mm
Width: 21.7mm
Height: 5mm
Weight: 2.3g
Mounting holes are 2.2mm(0.086in) diameter, 25mm(0.98in) apart
This board/chip uses I2C 7-bit address 0x68
Revision History
As of October 2022 - we've updated this PCB with Adafruit Pinguin to make a lovely and legible silkscreen - you may get the new PCB or the older version with vector fonts - both are identical other than the fancy silkscreen. We also may have a slim metal or chunky plastic 32.768KHz crystal placed, both are functionally identical.
