The Data Logger Shield for Arduino Uno & Mega is a plug-on expansion board that gives your Arduino the ability to record sensor data locally to an SD card, with each entry stamped with the current date and time from the onboard Real-Time Clock. This combination — storage plus time reference — is what makes it genuinely useful for field data collection, environmental monitoring, and STEM-based arduino projects where continuous data recording is needed without a PC connection.
The shield works by using the Arduino’s SPI bus to communicate with both the SD card slot and the RTC chip. The onboard 3.3V regulator handles the lower voltage requirement independently, which keeps the circuit clean and avoids the common problem of instability when powered directly from a 5V line.
Compatibility covers Data Logger Shield for Arduino Uno & Mega boards, making it a versatile shield across the most common Arduino platforms used in colleges, labs, and hobbyist projects.
Students working on environmental science projects, engineers prototyping, IoT sensor nodes, and makers building weather stations or energy monitors will find this shield a practical starting point. StemVolt stocks this module for learners and developers who need reliable, standalone data recording without complex hardware setup.
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Features:
- Onboard Real-Time Clock — RTC chip maintains accurate time even when the Arduino is powered off, ensuring logged data entries carry correct timestamps
- SD Card Data Storage — Supports FAT16 and FAT32 file systems; data is written as plain text or CSV files readable directly on a PC
- SPI Bus Communication — SD card and RTC both communicate via SPI, leaving most of the Arduino’s digital I/O pins free for sensor connections
- Direct Shield Mounting — Standard 2.54 mm headers plug directly onto Arduino Uno, Mega, Leonardo, and Diecimila without any wiring
- Battery Backup for RTC — Coin cell battery slot (CR1220 or equivalent) on most variants keeps the RTC running through power cycles and restarts
Technical Specifications:
| Specification | Details |
|---|---|
| Shield Type | Data Logger |
| Compatible Boards | Arduino UNO R3, Mega R3 |
| Onboard Voltage Regulator | 3.3V (for SD card power supply) |
| SD Card Interface | Supports FAT16 / FAT32 formatted cards |
| Real-Time Clock (RTC) | Onboard RTC for date and time stamping of logged data |
| Communication Interface | SPI (shared bus for SD card and RTC) |
Applications:
- Arduino UNO Projects — Build standalone sensor loggers on an Arduino UNO — data saves directly to the SD card during operation
- Arduino Mega 2560 Projects — Pair with the Mega’s larger I/O count to log data from multiple sensors simultaneously across analog and digital channels
- STEM Education and Experiments — Used in school and college projects for recording experimental data over time
- Weather Station Builds — Record barometric pressure, temperature, humidity, and rainfall data with accurate time references for weather pattern analysis
- IoT Prototype Backup Logging — Acts as a local data backup in IoT systems where cloud connectivity may be intermittent or unavailable
Package Includes:
-
1 x Data Logger Shield for Arduino Uno & Mega
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