DFRobot
DS1307 RTC Module with Battery for Raspberry Pi
A real-time clock (RTC) module designed specifically for the Raspberry Pi, built around the Maxim DS1307 chip. It communicates via I2C and includes a CR1220 ...
A real-time clock (RTC) module designed specifically for the Raspberry Pi, built around the Maxim DS1307 chip. It communicates via I2C and includes a CR1220 coin cell battery to maintain accurate timekeeping even when the Pi is powered down. The module plugs directly onto the Raspberry Pi GPIO header.
Compatible with Raspberry Pi Model B, A+, B+, 2 Model B, and 3 Model B.
Key Features
- DS1307 RTC Chip – Tracks seconds, minutes, hours, date, day, month, and year
- Battery Backup – Included CR1220 coin cell maintains time when powered off
- I2C Interface – Communicates at address 0x68
- Direct GPIO Connection – Plugs onto the Raspberry Pi header (2 × 5 pin, 2.54 mm)
- High Precision – ±2 ppm accuracy (0–40 °C)
Specifications
- RTC Chip – DS1307
- Battery – CR1220 coin cell (included)
- Operating Voltage – 5 V
- I2C Address – 0x68
- Clock Precision – ±2 ppm (0–40 °C)
- Operating Temperature – −10 °C to +85 °C
- Interface – 2 × 5 pin, 2.54 mm pitch
- Compatibility – Raspberry Pi B, A+, B+, 2B, 3B
Ideal For
- Adding persistent timekeeping to Raspberry Pi projects
- Data logging with accurate timestamps
- Scheduled tasks on offline Raspberry Pi systems
Package Contents
- 1× RTC Module with Battery for Raspberry Pi
- 1× CR1220 Coin Cell Battery (pre-installed)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- GPIO
- General-purpose input/output pins are microcontroller pins you can set in software to read signals, switch devices on and off, or connect to peripherals. The number of GPIO pins matters because it limits how many buttons, LEDs, sensors, and other parts you can wire directly to the board.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- I2C address
- An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
- ppm
- ppm means parts per million, a common way to express very small gas concentrations in air. For CO₂ sensors, the ppm range tells you what levels the sensor can measure, such as normal indoor air through to poorly ventilated spaces.
- RTC
- A Real-Time Clock keeps track of time even when the main processor is asleep or powered down, usually with a small backup battery. It matters for data logging and tracking projects that need accurate timestamps.
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