Arduino Nano Data Logger Shield with RTC and Micro SD Card Slot
This data logging shield plugs directly onto an Arduino Nano V3.0 and adds a DS1307 Real Time Clock, a micro SD card socket, and a lithium coin cell holder for RTC backup power in a single compact board. Every reading logged to the SD card carries an accurate timestamp from the RTC — critical for any experiment or monitoring application where knowing exactly when a measurement was taken matters. The SD card communicates over SPI, leaving the Nano’s I2C and analogue pins available for sensors.
- DS1307 RTC — keeps time to within ±2 seconds/day, backed by CR1220 coin cell
- Micro SD card slot — FAT16 and FAT32 formatted cards, up to 32GB
- Arduino Nano form factor — plugs directly onto Nano headers, no wiring
- I2C for RTC, SPI for SD — no pin conflicts with common sensor libraries
- Coin cell backup — RTC continues keeping time when the Nano is unpowered
| Specification | Value |
|---|---|
| RTC chip | DS1307 |
| RTC accuracy | ±2 seconds/day (typical) |
| RTC backup | CR1220 coin cell (not included) |
| SD card interface | SPI (CS on D10) |
| SD card format | FAT16 / FAT32, up to 32GB |
| Compatible board | Arduino Nano V3.0 (ATmega328P) |
Which library works with the DS1307 RTC on Arduino?
The RTClib library by Adafruit handles the DS1307 directly — RTClib.h, RTC_DS1307, and a single now() call return a DateTime object with year, month, day, hour, minute, and second. The SD library built into the Arduino IDE handles the micro SD card without any additional install.
Does the CR1220 coin cell keep the time when the Arduino is off?
Yes. The DS1307 draws under 300nA from the backup cell when the main supply is absent. A fresh CR1220 (225mAh typical) keeps the RTC running for several years between power-on sessions without needing a reset or re-synchronisation.
Best for
Arduino environmental data logging, weather station timestamping, soil moisture monitoring over days or weeks, greenhouse temperature records, battery-powered field sensor deployment, school science experiment data capture, and any Arduino Nano project needing timestamped CSV files on an SD card.
Why Kunkune
Shipped from UK stock. 60-day returns, no minimum order. Same-day dispatch on orders placed before 2pm.
Buying in bulk? For orders of 10+ units or trade pricing, contact us for a custom quote.
