DS1307 RTC I2C Module

DS1307 RTC I2C Module

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Straight Pin Header (Male) 1x40 Ways

Straight Pin Header (Male) 1x40 Ways

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  • รหัสสินค้า: BB-RTC-1307
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DS1307 is very popular Real Time Clock IC, perfect to keep your system time counting and keeping, and of course it is Arduino compatible :)

Arduino itself does not come with real time clock, although you can counting millisecond or second with time, but once the power is off, it losses count and not to forget the resources needed to store date, day, month and year, leap year too. Same goes to Raspberry Pi too.

This is Real Time Clock module integrated with RTC DS1307 IC and a back up CR2032 battery holder (Battery is not included). And it also comes with additional EEPROM memory IC, AT24C32 plus ready soldering pad to add digital temperature sensor DS18B20 (not supplied on the board) which are connected via I2C bus on a 27mm x 28mm x 8.4mm board.

DS1307 is a low-power real-time clock chip with 56 bytes of non-volatile RAM, full BCD code clock and calendar. The address and data will be communicated via a two-wire bidirectional serial bus (I2C), and the IC offers information such as seconds, minutes, hours, etc., and the number of days in each month can be automatically adjusted. Besides, there is a compensation function for leap year. AM / PM flag is to determine whether the clock operates in 24-hour or 12-hour mode, and there is a built-in power-sense circuit in the chip with powering down detecting and battery switching functions.

AT24Cxx series of EEPROM are produced by Microchip. AT24C32 on this board offers 32K bit (8192 bytes) of CMOS EEPROM memory with I2C bus data transfer protocol, which are electrically erasable, programmable for self-timed writing cycle (including auto erase time of no more than 10ms, typical time of 5ms) . It supports 1.8V to 5V power supply, which can be erased for one million times, and the data can be kept for 100 years. When using a 5V power supply, the I2C clock speed can reach 400 KHz.

The optional temperature sensor, DS18B20 adopts single-bus technology, which can effectively reduce external interference and improve the measurement accuracy. Meanwhile, it can convert the measured temperature directly into a serial digital signal for microcontroller to process.

Note: This module does not come with straight header pin, please get it here and you might need soldering tools.

Note: We notice this board comes with the circuit to charge LIR2032. As this type of battery is not common and expensive, many are using this module with CR2032 which you can get it from here. We have tested it with over 1 week of operation without problem. Use at your own risk !


  • DS1307 I2C Real-Time Clock IC (RTC)
  • AT24C32 32KBit (8KByte) I2C EEPROM memory  IC
  • CR2032 Back Up battery holder (battery not included)
  • Fresh new CR2032 can provides 1 year of timing for DS1307
  • Breaks out DS1307 clock pin to offer clock signals for the microcontroller.
  • Can be cascaded to other I2C devices.
  • 3.3V and 5.0V compatible.
  • Breakout I2C and Power pins for external microcontroller interface, example Arduino or PIC
  • Dimension: 27mm * 28mm * 8.4mm

Packing List:

  • 1 x DS1307 RTC module board


Is this suitable for maker uno? ( Lim , 26/04/2020 )
Hi, yes it is suitable. Thanks :)
Is this suitable for maker uno to use?
( Lim , 25/04/2020 )
Hi, yes it is suitable. Thanks :)

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แท็ก: RTC, Real Time Clock, DS1307, AT24C32, Back up, External memory