# Gravity: I2C DS1307 RTC Module

**Type:** Product page · **SKU:** DFR0151 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/real-time-clock-module-ds1307-v1-1.html ([markdown](https://core-electronics.com.au/real-time-clock-module-ds1307-v1-1.html.md))

The DS1307 Real Time Clock developed by one of our designers: Waiman. The module comes fully assembled and pre-programmed with the current time (ok, so it's our current time - MST).

## Pricing

- **Price:** $6.85 (inc GST) — $6.23 AUD, exc GST
- **Quantity discounts:** 6+ $5.92 (exc GST) · 12+ $5.66 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 9 today, and up to 500 more in 8–12 days.

## Restrictions

Restrictions apply to this equipment as it uses button/coin cell batteries:

- The equipment is intended to be used in trades, professions or industries
- The equipment is not intended for sale to the general public
- The equipment is not intended to be used where children are present
- You are aware that this equipment may not meet child safety testing requirements as it is not intended to be used by consumers or general public, but rather, is intended to be used in trades, professions or industries in conjunction with the limitations and restrictions listed above
- You are aware that these restrictions are due to a change in [A](https://www.accc.gov.au/media-release/businesses-on-notice-as-mandatory-button-battery-laws-commence)[ustralian legislation in 2022](https://www.accc.gov.au/media-release/businesses-on-notice-as-mandatory-button-battery-laws-commence) for button/coin cell batteries
 
![Button Battery Warning](https://core-electronics.com.au/attachments/uploads/iec-button-battery.png)

A declaration of use will need to be submitted during checkout.

## Description

The **Gravity I2C DS1307 RTC Module** is an upgraded version of the classic DS1307 real-time clock. Designed with a compact form factor and a reliable **Gravity I2C interface**, this module is easier to integrate into miniaturized applications.

Built for precision, the new version adopts a **high-accuracy crystal oscillator**, reducing time errors to as little as **~1 second per 24 hours** (compared to ~20 seconds in most mechanical watches). This makes it ideal for projects requiring dependable long-term timekeeping.

 
Note: The battery is not include- [Pick a battery up here!](https://core-electronics.com.au/coin-cell-battery-12-5mm-cr1220.html)### SPECIFICATION

- Operating voltage: 5V
- Interface: IIC/I2C (Gravity PH2.0-4P Interface & XH2.54 Pins)
- IC Output Data: Hour, Minutes, Seconds, Week, Day, Month, Year
- Leap-year Compensation
- Accurate calendar up to year 2100
- 1Hz Output Pin
- 56 Bytes of Non-volatile memory available to user
- 4KB ROM of EEPROM
- Size: 0.81inch x 1.06inch (22mm x 27mm)
- Weight: 6g
 
### DOCUMENTS

 [Product wiki](https://wiki.dfrobot.com/Gravity__I2C_DS1307_RTC_Module_SKU__DFR0151)### SHIPPING LIST

- Gravity: I2C DS1307 RTC Module x1
- Gravity-4Pin I2C/UART Cable x1
- XH2.54-5P Pin Header x1

## Guides for this product

- [How to use a RTC With an Arduino UNO R3 to Create an Accurate Clock (LCD Screen and Nixie Tubes)](https://core-electronics.com.au/guides/arduino/accurate-clock-arduino-uno/)

## Videos for this product

- [How to use a RTC With an Arduino UNO R3 to Create an Accurate Clock](https://core-electronics.com.au/videos/how-to-use-a-rtc-with-an-arduino-uno-r3-to-create-an-accurate-clock)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/d/f/dfr0151-1.jpg)