Grove Real Time Clock DS1307

Grove Real Time Clock DS1307




Grove - DS1307 RTC is based on the clock chip DS1307 and supports I2C communication! It uses a Lithium cell battery (CR1225). We choose to use the RTC based on DS1307 as it is low-cost and energy efficient. It can run for years on a very small coin cell.

The RTC module is based on the clock chip DS1307, which supports the I2C protocol. It utilizes a Lithium cell battery (CR1225). The clock/calendar provides seconds, minutes, hours, days, dates, months, and years. The end-of-the-month date is automatically adjusted for months with fewer than 31 days, including corrections for leap years. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. And it is valid up to 2100. In order to gain a robust performance, you must put a 3-Volt CR1225 lithium cell in the battery holder. The DS1307 has a built-in power sense circuit that detects power failures and automatically switches to the battery supply. If you use the primary power only, the module may not work normally, because the crystal may not oscillate.

What is an RTC (Real Time Clock), and why do we need RTC for Arduino microcontrollers?

An RTC (Real Time Clock) is a clock that keeps track of the current time and can be used to program actions at a specific time. Arduino and almost all microcontrollers have built-in timers that can run as long as there is power. However, as soon as the power is turned off (either manually or due to a power failure), all timers are reset to 0. It is acceptable to use the internal timer for timing simple projects if you don't mind the timer resetting to zero when the power is turned off. But for projects such as data loggers, clocks, and alarms, where the timer needs to run independently of the external power supply, you need to use an RTC. Almost all RTCs are low-power integrated ICs and can run for many years on a single lithium battery. At present, the RTC based on the DS1307 real-time clock is one of the most popular RTC modules.

Highlighted Features

  • Complete functionality: Real-time clock (RTC) counts seconds, minutes, hours, date of the month, month, day of the week, and year with leap-year compensation valid up to 2100.
  • Power detection: Automatic power-fail detection and switch circuitry.
  • Longevity: Consumes less than 500nA in battery backup mode with oscillator running
  • Grove unified socket: The product ensures "Plug and Play" and could be versatile for various applications.


  • Real-Time Clock


Data Sheet