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Green Arduino shield with SD slot, RTC chip, battery holder, and prototyping grid

Adafruit

Adafruit Assembled Data Logging Shield for Arduino with RTC and SD

SKU CH-47FN-JQ0S6

An assembled Arduino shield that logs data to SD cards with a battery-backed real-time clock and includes a prototyping area for custom circuits

  • Product typeEngineering Development Tools
  • On-board RTC timestamps data even when unplugged
  • Battery-backed clock runs for years without replacement
  • Ready-to-use libraries and examples accelerate development
  • Prototyping area allows custom sensors and connectors
  • Compatible with Uno, Leonardo, Mega R3 and earlier boards

Data-logging shield with RTC and SD

This assembled shield adds a real-time clock and SD-card interface to compatible Arduino boards. A prototyping area lets you solder custom connectors, circuitry or sensors directly on the board. Adafruit libraries and example code for both the SD and RTC functions help you start logging data quickly. The on-board battery-backed clock keeps time even when the Arduino is unplugged.

Check board compatibility before ordering

The shield works with Arduino UNO, Duemilanove, Diecimila, Leonardo or ADK/Mega R3 and higher. ADK/Mega R2 or lower are not supported. Verify that your board matches one of the listed models and that you have a FAT16 or FAT32 formatted SD card ready for data storage. The kit arrives fully assembled so no soldering of the main components is required.

Sustained logging with battery-backed timekeeping

Under continuous operation the RTC maintains accurate timestamps for years on its backup battery, so every data point stays synchronised even during power cycles. Writing to the SD card proceeds at the speed allowed by the card and the Arduino SPI bus, letting you capture long-running experiments without gaps. The prototyping area remains available for permanent sensor wiring that will not loosen over time.

How it compares

Measured against everything we stock in Engineering Workstations & Dev Kits, at today’s prices. Recalculated every night.

Price $13.99
Pricier than about 60% of the 170 comparable items (median $11.49).

Specifications

Product
Product typeEngineering Development Tools

Questions about this item

Does the shield arrive fully assembled with the SD slot and RTC already fitted, or must I solder them myself?

The shield is supplied fully assembled with the SD card slot and real-time clock already soldered in place, so you can start logging data immediately.

Which Arduino boards are confirmed to work with this R3-compatible shield?

It works with Arduino UNO, Duemilanove, Diecimila, Leonardo and ADK or Mega R3 and higher; ADK or Mega R2 and lower are not supported.

How long can the onboard RTC keep time when the Arduino is powered off?

The fitted coin-cell battery powers the real-time clock for years while the Arduino is unplugged, preserving timestamps for your data logs.

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