Real Time Clock Module – DS1307


C-4, R-1 , I-3

Original price was: ₪ 45.0.Current price is: ₪ 27.0.

Product ID: 1850 SKU: mod-1850 Categories: , Tags: , , ,

This a custom designed module for the DS1307 Real Time Clock. The module comes fully assembled and pre-programmed with the current time (ok, so it’s * our current time – *MST).  The DS1307 RTC is accessed via the I2C protocol. We’ve written a test-bed to program the modules. This test-bed code should give you some insight on how to interface the module to any microcontroller using our example software I2C and BCD routines.


  • Two wire I2C interface
  • Hour : Minutes : Seconds AM/PM
  • Day Month, Date – Year
  • Leap year compensation
  • Accurate calendar up to year 2100
  • Battery Not included
  • 1Hz output pin
  • 56 Bytes of Non-volatile memory available to user

Wiring the RTC to Arduino

Arduino Tiny RTC I2C Real Time Clock Pinout

PIN Description Comment
BAT Battery voltage To monitor the battery voltage, or not connected
GND Ground Ground
VCC 5V supply Power the module and charge the battery
SDA I2C data I2C data for the RTC
SCL I2C clock I2C clock for the RTC
DS DS18B20 Temp. Sensor output One wire inteface
SQ Square wave output Normally not used

The I2C wires “SDA” and “SCL” are the data line and clock line, they should be connected to the corresponding pins depending on the Arduino board.

Board I2C / TWI pins
Uno, Ethernet A4 (SDA), A5 (SCL)
Mega2560 20 (SDA), 21 (SCL)
Leonardo 2 (SDA), 3 (SCL)
Due 20 (SDA), 21 (SCL), SDA1SCL1

Example code is available here.





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