Logging from a sensor using RTC and SD card
This FeatherWing is a great solution since it includes both the RTC and the SD adapter: https://www.youtube.com/watch?v=_xZMf6PVyvE
Michael Cartwright
Adafruit
Adalogger FeatherWing - RTC + SD Add-on For All Feather Boards
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Add datalogging capability to any Feather board with the Adalogger FeatherWing. This add-on combines a battery-backed real-time clock (PCF8523) with a microS...
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Add datalogging capability to any Feather board with the Adalogger FeatherWing. This add-on combines a battery-backed real-time clock (PCF8523) with a microSD card socket, giving your project accurate timestamps and local data storage in one compact wing.
The RTC communicates over I2C with a 32 KHz crystal for reliable timekeeping, while the microSD socket connects via SPI for fast data read/write. Tested and compatible with all Adafruit Feather boards. Attach it using Feather Stacking Headers to stack multiple FeatherWings together.
Key Features
- PCF8523 Real-Time Clock – I2C RTC with 32 KHz crystal for accurate timekeeping
- Battery Backup – CR1220 coin cell keeps the RTC running when power is removed
- MicroSD Card Socket – SPI-connected storage for datalogging and file storage
- Universal Feather Compatibility – Works with all Adafruit Feather main boards
- Arduino & CircuitPython Support – Libraries and example code available for both platforms
Ideal For
- Environmental and sensor datalogging
- Time-stamped data collection projects
- Portable field recording devices
- Any Feather project needing local storage and accurate time
Package Contents
- 1× Adalogger FeatherWing (assembled and tested)
Note: MicroSD card and CR1220 coin cell battery are not included. The battery is only needed for RTC backup. For higher-precision timekeeping, consider the DS3231 Precision RTC FeatherWing.
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- FeatherWing
- A FeatherWing is an add-on board made to plug into the Feather microcontroller board layout. Knowing a product is a FeatherWing helps you check whether it will physically and electrically fit your Feather-style mainboard.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- microSD card
- A microSD card is a small removable flash memory card used to store data such as audio, images, logs or program files. Its capacity and formatting (often FAT32 or exFAT) affect how much can be stored and whether the card needs preparing before use.
- RTC
- A Real-Time Clock keeps track of time even when the main processor is asleep or powered down, usually with a small backup battery. It matters for data logging and tracking projects that need accurate timestamps.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
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