RTC DS1302 Real Time Clock Module Expand

RTC DS1302 Real Time Clock Module



Simple DS1302 based RTC module. Battery backup keeps track of time and date, even leap years! 

Battery not included. 

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This RTC DS1302 module allows you to use your Arduino or MCU to do time / date related functions such as: Starting a task at a specific date / time or recording the date / time of an event (datalogging!) or simply displaying the time / date to a user. 

The backup battery (not included, please purchase a CR2032 battery from the suggested items) makes sure that the time and date are kept accurate even if your Arduino / MCU is powered off.


  • DS1302 timing IC
  • This real time clock has the ability track second, minute, hour, day, week, month, year, and the ability to adjust a leap year
  • Wide working voltage: 2.0~5.5 V
  • When The working voltage is 2.0V, the current is less than 300nA
  • Read/write clock or RAM data have two transmission modes: Single-byte / many bytes group
  • Simple 3 line interface. Easy to install

Pin out:

  • VCC -> Vsupply (Arduino 3.3V)
  • GND -> Arduino Gnd
  • CLK ->  (SCLK_PIN)
  • DAT -> (IO_PIN)
  • RST -> (CE_PIN)

Works great using the DS1302 library written by Henning Karlsen. The library can be found at http://www.henningkarlsen.com/electronics/library.php?id=5.

Battery not included.

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RTC DS1302 Real Time Clock Module

RTC DS1302 Real Time Clock Module