Gravity 128MB Serial Data Logger Module for Arduino

The Gravity data logger from DFRobot stores everything a microcontroller sends via the serial interface (UART) on 128 MB of internal flash memory, without a memory card and without its own code for saving. On the PC it appears via USB-C like a USB stick, the files can be read directly. Data is saved as TXT or CSV, the SAVE button starts a new file.

Note: The connection cable can be converted to male pins with a Dupont cable M-M, so that it also fits an Arduino UNO.

Recommended Accessories:

• Dupont Cables M-M 10cm 20 Pieces

Features:

• 128 MB flash memory, no memory card needed
• USB-C: on the PC like a USB stick, without card reader
• File formats TXT and CSV
• Settings such as the baud rate in the file CONFIG.TXT, which is created at the first start
• New file via the SAVE button or LOW on pin S, also time-controlled
• LED indicates writing
• As long as a USB host is connected, the module works as a USB stick and does not store data (DFRobot FAQ)
• Version V2.0; for V1.0 (before May 2022) there is a firmware update in the wiki

Application Examples:

• Recording readings without a PC
• Logging the output of a device
• Troubleshooting robots and drones

Documentation:

• Wiki DFRobot TEL0147 with first steps and examples for Arduino
• Schematic (PDF)
• Dimensional drawing (PDF)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: TEL0147
• Version: V2.0
• Memory: 128 MB flash
• Supply: 3.3 to 5 V
• Operating current: 10 mA
• Interfaces: UART (Gravity 4-pin), USB 2.0 (USB-C)
• Pins: VCC (+), GND (-), RX (R), TX (T), S (SAVE, active LOW)
• File formats: TXT, CSV
• Operating temperature: -20 to 65 °C
• Humidity: 5 to 85 % RH
• Dimensions: 32 × 27 × 7 mm
• Weight: 14 g

Scope of Delivery:

• 1× Gravity Serial Data Logger V2.0
• 1× Gravity sensor cable 4-pin I2C/UART
• 1× pin header 10-pin 2.54 mm