Adafruit DS1307 Real Time Clock Assembled Breakout Board
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.
The 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.
Key Features
- Battery-Backed Timekeeping – Maintains time through power loss and reprogramming
- I2C Interface – Simple two-wire communication
- 5+ Year Battery Life – With CR1220 coin cell (not included)
- Fully Assembled – PCB and headers included, breadboard-ready
- Two Mounting Holes – For permanent installations
Also Available
- DS3231 Precision RTC – Temperature-compensated, ±2 ppm accuracy
- PCF8523 RTC – 3.3V compatible, affordable alternative
Ideal For
- Datalogging with timestamps
- Clock and alarm projects
- Scheduled automation and timers
- Any project needing persistent timekeeping
Package Contents
- 1× DS1307 RTC breakout board (fully assembled with headers)
Product Information
Product Information
Shipping & Returns
Shipping & Returns
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.
The 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.
Key Features
- Battery-Backed Timekeeping – Maintains time through power loss and reprogramming
- I2C Interface – Simple two-wire communication
- 5+ Year Battery Life – With CR1220 coin cell (not included)
- Fully Assembled – PCB and headers included, breadboard-ready
- Two Mounting Holes – For permanent installations
Also Available
- DS3231 Precision RTC – Temperature-compensated, ±2 ppm accuracy
- PCF8523 RTC – 3.3V compatible, affordable alternative
Ideal For
- Datalogging with timestamps
- Clock and alarm projects
- Scheduled automation and timers
- Any project needing persistent timekeeping
Package Contents
- 1× DS1307 RTC breakout board (fully assembled with headers)
