WeMos D1 Mini Data Logger Shield with DS1307 RTC and MicroSD Card Slot

WeMos D1 Mini Data Logger Shield with DS1307 RTC and MicroSD Card Slot
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  • Product Code:SQ6546
  • Availability: 1000
  • $1.65
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Tags: WeMos D1 Mini shield, data logger shield, DS1307 RTC, MicroSD shield, ESP8266 data logging, real time clock shield, Arduino data logger, timestamped logging, IoT data logger, D1 Mini expansion

The WeMos D1 Mini Data Logger Shield is a stackable expansion board designed to add timestamped data storage to the WeMos D1 Mini (ESP8266) development platform. Combining a DS1307 real-time clock (RTC) with a MicroSD card slot, this shield allows the host board to record sensor readings, digital events, and analog measurements to a removable memory card, with each entry accurately stamped with the current date and time. This makes it a practical solution for IoT data logging, environmental monitoring, and offline sensor recording where Wi-Fi connectivity may be intermittent or unavailable.

The DS1307 RTC chip maintains accurate timekeeping through an I2C interface and continues to run from a 3.0V CR1220 lithium coin cell battery when the main power is removed. The MicroSD card interface supports FAT16 and FAT32 file systems, enabling easy transfer of log files to a computer for analysis in spreadsheet or data-processing software. The shield draws its operating power from the WeMos D1 Mini board (3.3V) and uses dedicated I2C (D1–SCL, D2–SDA) and SPI (D5–CLK, D6–MISO, D7–MOSI, D8–CS) pins for communication, leaving other GPIOs available for sensors and peripherals.

The board is supplied with male and female pin headers, including stackable headers, allowing the D1 Mini to be mounted directly onto the shield. Once assembled, the combined stack can be deployed for industrial equipment monitoring, household appliance data collection, medical device logging, and agricultural sensor networks. Whether the goal is to build a weather station, a temperature and humidity logger, or a diagnostic recorder for system events, the WeMos D1 Mini Data Logger Shield provides a compact and cost-effective hardware foundation for timestamped data acquisition.

D1 Mini data logging shield Application

  1. Timestamped sensor data logging for IoT and ESP8266 projects
  2. Weather station data recording with date and time stamps
  3. Temperature and humidity monitoring logs
  4. Industrial equipment event and diagnostic recording
  5. Household appliance and energy consumption logging
  6. Medical device data collection and archiving
  7. Agricultural sensor networks and environmental monitoring
  8. Offline data backup when Wi-Fi connectivity is unavailable

D1 Mini data logging shield Specifications

  1. Product Model: WeMos D1 Mini-Logger
  2. Compatible Board: WeMos D1 Mini (ESP8266)
  3. RTC Chip: DS1307
  4. RTC Interface: I2C (D1–SCL, D2–SDA)
  5. RTC I2C Address: 0x68
  6. RTC Backup Battery: 3.0V CR1220 lithium coin cell
  7. RTC Battery Backup Current: Less than 500nA (with oscillator running)
  8. RTC SRAM: 56 bytes of battery-backed NV SRAM
  9. RTC Accuracy: ±20ppm at room temperature (approximately ±2 seconds per day); drifts further at temperature extremes
  10. Storage Interface: MicroSD card slot
  11. Supported File Systems: FAT16 / FAT32
  12. MicroSD Pin Mapping: D5–CLK, D6–MISO, D7–MOSI, D8–CS
  13. Operating Voltage: 3.3V (supplied from WeMos D1 Mini board)
  14. Board Dimensions (Approx.): 28mm × 25mm × 5mm
  15. Weight (Approx.): 5–8 g
  16. Pin Headers Included: Male, female, and stackable headers

Features

  1. Stackable data logging shield for the WeMos D1 Mini (ESP8266) platform
  2. DS1307 real-time clock (RTC) with I2C interface and 0x68 slave address
  3. 56 bytes of battery-backed non-volatile SRAM for user data storage
  4. CR1220 lithium coin cell backup keeps the RTC running without main power
  5. Ultra-low battery backup current of less than 500nA
  6. MicroSD card slot supporting FAT16 and FAT32 file systems
  7. Dedicated SPI interface for MicroSD (D5–CLK, D6–MISO, D7–MOSI, D8–CS)
  8. Dedicated I2C interface for RTC (D1–SCL, D2–SDA), leaving other GPIOs free
  9. 3.3V operation powered directly from the WeMos D1 Mini board
  10. Compact board dimensions of approximately 28mm × 25mm × 5mm
  11. Includes male, female, and stackable pin headers for solder-free assembly
  12. Compatible with standard Arduino libraries (RTClib, SD, Wire)
  13. Ideal for timestamped sensor logging, weather stations, and diagnostic recorders
  14. RTC accuracy of ±20ppm at room temperature, adequate for general data logging applications
Interfaces
Interface Type CLock : I2C And SD Card : SPI
Physical Parameters
Size 26mm x 28mm
Weight 8g

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