WitMotion JY-DATA-LOG / JY-DATA-LOG-BLE Serial Data Recorder Module, TTL SD Card Logger, BLE5.0, 3.3-5V
WitMotion JY-DATA-LOG / JY-DATA-LOG-BLE Serial Data Recorder Module, TTL SD Card Logger, BLE5.0, 3.3-5V
WitMotion
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Overview
WitMotion JY-DATA-LOG is a serial data recorder module designed for high-speed serial data storage to an SD card. It works like a “black box”: data is saved in TXT format on the SD card, and parameters can be configured via a generated config.txt file. Two styles are available: JY-DATA-LOG (standard) and JY-DATA-LOG-BLE (Bluetooth/BLE version).
Key Features
- Serial data storage to SD card (high-speed SD card logger)
- 16KB large buffer/cache to help avoid data loss (stated as “16KB large buffer area, avoid data loss”)
- Recorded files saved in .TXT format on the SD card
- On first power-up with an SD card inserted, the module generates config.txt (includes baud rate parameters, etc.); recorder baud rate should match the IMU’s baud rate
- Configuration and writing via config.txt (baud, pack/file numbering, file size limit)
- Shield protection and multiple indicator light modes (easy to analyze)
- Bluetooth SD Recorder (JY-DATA-LOG-BLE): remote modification by Bluetooth; Bluetooth can view real-time data recording and send transparent data; can set file size limit and data time stamp
- PC software is provided for users to develop and test
Specifications
| Name | High-speed SD card recorder |
| Voltage | 3.3V~5V |
| Current | < 32mA |
| Interface | Serial port TTL |
| Baud rate (Standard version) | 2400-921600 (Default: 9600) |
| Baud rate (Bluetooth version) | 460800 (Default: 9600) |
| Data rate (Standard version) | 90KB/s |
| Data rate (Bluetooth version) | 46KB/s |
| Dimensions (Standard version) | 19*15*4.4mm |
| Dimensions (Bluetooth version) | 25*15*4.6mm |
| Weight (Standard version) | 1.7g |
| Weight (Bluetooth version) | 1.9g |
| Pad pitch (shown) | 2.54mm |
| Mechanical markings (shown) | 0.9mm; 0.8mm |
Interface (Pin Definitions)
| EN | Power enable pin; pull high to make the module work; pull low to not work |
| GND | Ground wire, negative power supply |
| VCC | Power supply positive, input 3.3-5V |
| TX | TTL sending pin |
| RX | TTL receiving pin |
| D1 | Cache alarm pin; pull high when the cache is less than 1KB; pull down when the cache is greater than 1KB |
Configuration Notes (config.txt)
- Example config line shown: baud=2,pack=1,FileSizeLimit:0
- Baud list shown: 0:2400, 1:4800, 2:9600, 3:19200, 4:38400, 5:57600, 6:115200, 7:230400, 8:460800
- Explanation shown (JY-DATA-LOG-BLE): baud=2 means baud rate is 9600
- Explanation shown: pack=00006 means the next recorded file name is LOG00006.TXT (serial number automatically increments without manual modification)
- Explanation shown: FileSizeLimit=0 means file size is not limited; if FileSizeLimit=1024, maximum is 1K data
Applications
- TTL serial data logging to SD card for sensors and controllers (e.g., IMU serial data recording)
- Debugging and test data capture where a compact SD card data logger module is needed
Support
For pre-sales questions and configuration help, contact https://rcdrone.top/ or email support@rcdrone.top.
Details
Choose the standard JY-DATA-LOG for wired TTL logging, or the JY-DATA-LOG-BLE version for added Bluetooth/BLE control.
Recorded serial data is stored to the SD card as .TXT files, with settings generated in a config.txt file on first power-up.
Quick setup is handled by editing config.txt for baud rate, auto-incrementing log file numbers, and optional file size limits.
Bluetooth/BLE lets you adjust logging parameters remotely and monitor recording status while data writes to the SD card.
Electrical and performance specs include a 3.3–5V supply, TTL serial interface, and version-specific baud and throughput ratings.
Compact footprints make integration easy: the standard and BLE versions differ in length and thickness while keeping 2.54 mm pad pitch.
Clear pin definitions simplify wiring: power, UART TX/RX, enable control, and a cache-alarm indicator output are all broken out.
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