Tiny Real Time Clock I2C Module RTC DS1307 for D1 Mini

  • RM15.00

  • Product Code: DS1307-D1-MINI
  • Availability: In Stock


The WeMos D1 Mini family of boards is one of the latest additions to the ESP8266-based IoT ecosystem. The WeMos D1 Mini Real-Time Clock Shield allows you to add a Real-Time Clock (RTC) to your WeMos mini or mini Pro development boards. Using an RTC is the best way to keep track of time in your projects, for instance, when time-stamping data captured by a sensor (data logging).

The WeMos D1 Mini RTC Shield is designed so that pins D2 (SDA) and D1 (SCL) are connected to the DS1307 real-time clock chip's I2C pins onboard. The I2C interface of the shield has a fixed address of 0x68. The DS1307 RTC is a low-cost, low-power real-time clock IC that can maintain full clock and calendar, i.e., hours, minutes, seconds as well as year, month and day. As with all RTCs, it maintains track of time even if the microcontroller loses power using a backup CR1220 battery (not included).

What makes the WeMos family of development boards for the ESP8266 great is the availability of stackable, plug-and-play shields such as this WeMos D1 Mini RTC Shield. Without much fuss, it's very easy to connect, control, and monitor a wide variety of electronic components to the ESP8266. The WeMos family is a great solution for building projects quickly using the ESP8266 SoC.

Different users have different applications for the WeMos shields, thus we've found that the easiest way to please everyone is to ship the boards with the headers unsoldered. Each board in this kit includes a pair of Male, Female, Long Female pin headers for you to choose. Soldering is required for installing the header pins!



  • Battery not included
  • Soldering required



  • Real-Time Clock (DS1307) Shield for the WeMos family of boards for the ESP8266 and ESP32
  • Operating voltage: 3.3VDC
  • RTC Chipset: DS1307
  • DS1307 control pins:D2 (SDA) and D1 (SCL); I2C address: 0x68
  • Backup battery type: CR1220 (3.0VDC)


Package included

  • 1 x DataLog Shield
  • 2 x Male Pin Header
  • 2 x Female Pin Header
  • 2 x Stackable Header



Could direct mount on D1 Mini or 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), SDA1, SCL1

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Tags: Arduino, Real Time Clock, Tiny RTC I2C,