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Freematics ONE (aka Freematics Vehicle Data Logger V4) is the state-of-the-art vehicle telematics data collector, adapter, logger and transmitter which envolves from the past 3 generations of Freematics Vehicle Data Logger. Freematics ONE, like its predecessors, comes in the form of a OBD-II dongle which plugs into a car's OBD-II port. The enclosure is newly designed with sockets and card slots for various purposes around it. And the original 32-bit OBD-II solution has been improved, which has been proven in the previous OBD-II products, with better support for high data rate GPS and additional support for external wireless modules. It also integrats the innovative Bluno (An Arduino Bluetooth 4.0 (BLE) Board) which allows firmware/sketch updating directly from Arduino IDE via micro USB port and wirelessly via BLE. Freematics ONE supports BLE, GPS and xbee socket, you could choose the compatible accessories you need on the right options.

Freematics ONE plugs into the OBD port usually located under the steering column or slightly to the left of it. To check if your vehicle is OBD-II certified, open your hood and find the sticker that looks like this:

  • Powered from OBD-II port (low power consumption)
  • Programmable as an Arduino UNO (sketch uploaded via USB or BLE)
  • Rapid access to OBD-II PIDs (including VIN)
  • Reading and clearing trouble code (DTC)
  • Measuring G-force with accelerometer
  • Measuring battery voltage with built-in voltmeter
  • BLE wireless communication with iOS and Android devices
  • High update rate GPS positioning (by external GPS receiver for better signal strength)
  • Onboard xBee socket for communication module extension
  • microSD data storage (up to 32GB)
  • Upgrading OBD-II solution firmware via USB


  • STM32 based OBD-II solution (CAN BUS, K-line, NMEA parsing)
  • Compatible with Arduino UNO/Bluno (ATmega328p main controller)
  • STM32 and ATmega328p connected by SPI
  • TI CC2540 based BLE & USB connectivity
  • MPU-6050 MEMS module (accelerometer, gyroscope, temperature sensors)
  • Built-in xBee socket for exchangeable wireless communication modules (GSM, WIFI, xBee)
  • SIM800L xBee module with self-popping micro SIM socket
  • Self-popping microSD slot with cover
  • Molex connector for external GPS receiver
  • Enclosure dimensions: 60x48x20mm
  • Hardware Interfaces:
    • OBD-II male connector
    • microUSB port
    • microSD card slot
    • SIM card slot (if cellular module is present)
    • GPS connector (Molex)
    • xBee socket (inside, 5V or 3.3V VCC)
  • Compatibility: Vehicles using following vehicle protocols are supported
    • CAN 500Kbps/29bit
    • CAN 250Kbps/29bit
    • KWP2000 Fast
    • KWP2000 5Kbps



  • Freematics Vehicle Data logger V4 x1
  • Micro USB cable x1

The Freematics Vehicle Data Logger V4 appears in the following collections: