Freematics ONE+ is our most powerful Arduino programmable vehicle telematics prototyping platform, an enhanced version of Freematics ONE with forward compatibility.

Freematics ONE+, like its predecessors, is in form of a OBD-II dongle which plugs directly into a car’s OBD-II port and works as a standalone small-footprint yet powerful micro-controller which has access to a variety of data from vehicle ECU, high accuracy GPS receiver, 9-DOF motion sensor. Large amount of collected data can be processed in real-time, stored in Flash memory or microSD card and transmitted by BLE, WIFI or over cellular network.


  • Dual-core ARM SoC processor for complex computation tasks
  • High performance WIFI and BLE communications
  • G-force measurement and motion/orientation detection
  • High update rate GPS positioning
  • Access to all standard OBD-II PIDs, DTC, VIN from vehicle ECU
  • Car battery voltage reading
  • Data storage in internal Flash or microSD card (up to 32GB)
  • Exchanging data with other devices by USB or BLE
  • Transmitting data remotely over WIFI or cellular network
  • Programmable as Arduino with dedicated Arduino library
  • Low power mode @10mA


Hardware Facts


  • Espressif ESP32 as main controller (520KB SRAM, 4MB Flash, programmed as Arduino)
  • Built-in 802.11 b/g/n HT40 Wi-Fi transceiver
  • Built-in dual mode Bluetooth (classic and BLE)
  • Integrated original STM32 based OBD-II solution
  • Integrated MEMS motion sensor
  • M8030 10Hz GPS receiver (external)
  • xBee seat for pluggable wireless communication modules
  • SIM800L or SIM5360 bee modules for cellular network connectivity
  • Enclosure dimensions: 60x48x20mm

Physical Interfaces

  • OBD-II male connector
  • microUSB port
  • microSD card slot
  • SIM card slot (when cellular module is present)
  • GPS connector (Molex)
  • xBee socket (5V VCC)

OBD-II Compatibility

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


Vehicles using following vehicle protocols are supported.

  • CAN 500Kbps/29bit
  • CAN 250Kbps/29bit
  • CAN 500Kbps/11bit
  • CAN 250Kbps/11bit
  • KWP2000 Fast
  • KWP2000 5Kbps


Freematics ONE+ supports accurate geolocation positioning with an external GPS receiver with a connector of Molex 4-pin one. M8030 10Hz GPS provides high accuracy (up to 2 meters) and high update rate (10Hz). The receiver has a 1.5m long cable and is convenient to be placed where  well exposed to open sky.

UBX-M8030 GPS Receiver with Molex connector Freematics ONE GPS Connector F-ONE_3497


Cellular Network Module

Freematics ONE+ has an xBee socket inside to provide the possibility of extending wireless communication capability with various bee modules. We have designed and provide 3 types of cellular network modules working perfectly with Freematics ONE+. Please be noted that xBee socket uses 5V VCC instead of normal 3.3V due to the efficiency consideration for powering cellular modules. Following chart compares the 3 types of cellular modules currently available.

SIM800L SIM5360E SIM5360A
GSM/GPRS Quad-band
GSM/EDGE N/A Quad-Band
N/A Dual-Band
Power Consumption 2W @ 850/900MHz
1W @ 1800/1900MHz
0.25W @ UMTS 900/2100
2W @ GSM850/GSM900
1W @ DCS1800/PCS1900
0.25W @ UMTS 850/1900
2W @ GSM850/GSM900
1W @ DCS1800/PCS1900
Popular Regions Worldwide Europe, Asia, Japan*, Australia* US, Canada, Japan*, Australia*

* Countries including Japan and Australia have both 3G bands in operation by different operators. Complete information is here.

When cellular network module included, Freematics ONE+ comes with built-in antenna inside enclosure. It works great in most cases. To improve cellular network signal level in areas with poor coverage, there is an option of external antenna connected via a SMA connector which can boost signal by 4-8dB and significantly reduce the heat generated by the working network module. Please be noted the antenna option is not available from quick order.

Low-Power Mode

Freematics ONE+ enters and leaves low power mode programmatically. In low power mode with all peripherals (GPS, GSM, WIFI) powered off, the power consumption is around 10mA. This prevents car battery from going flat while the main controller is still able to run code and perform low-power tasks like motion detection by MEMS sensor.


The schematic is here. We supply head-less (no OBD-II header) or bear PCB versions. Please contact for details.


Freematics ONE+ vs Freematics ONE

Freematics ONE+ Freematics ONE
Programmable Processor 32-bit Dual-Core ARM @ 240Mhz 8-bit AVR MCU @ 16Mhz
Real-time Operating System FreeRTOS (multi-threading) N/A
Development Environment Platform IO, Arduino IDE etc. Platform IO, Arduino IDE etc.
Arduino Library Features OBD-II/GPS/MEMS access,
networking, data storage, BLE GATT server
WIFI Built-in 802.11 b/g/n (SDK) Optional by ESP8266 module (AT-command)
Bluetooth Built-in BLE+BT (SDK) Optional by CC2541 module (serial)
GPS 10Hz GPS/GLONASS, direct access (UART2) 5Hz GPS, accessed by proxy chip
Cellular Module GSM/GPRS/WCDMA bee module, direct access (UART1) GSM/GPRS bee module, accessed by proxy chip
Program Space 4MB or 16MB Flash + 520KB RAM 32KB Flash + 2KB RAM
Data Storage microSD or built-in Flash microSD
Device LED Dual LED, GPIO controlled + communication indicator Communication indicator
Suitable Applications Real-time processing and logging for massive data sampled at high rate, low-latency data transmission with various protocols over BLE, WIFI or 3G network Local data logging and simple data transmission over BLE, WIFI or GPRS



The most exciting thing about this product is that you can create your own unique product or solution on top massive accomplished work. We have been developing and maintaining a dedicated  Arduino library and a fully functional reference Arduino sketch for this product. Together with our free Freematics Hub telematics server software and Freematics Arduino Builder, we intend to bring the best out-of-box experience for novice developers. If you are a pro, we highly recommend PlatformIO IDE as development environment and our reference code is organized as a PlatformIO projects, though you can still use Arduino IDE or Arduino makefile with ESP-IDF. As bonus, our Freematics Arduino Builder has been customized for easily configuring, compiling and uploading code to Freematics ONE+. For more information about development, please refer to the Developers Guide.


Shipping List

  • Freematics ONE+ x 1
  • Micro USB cable x 1
  • M8030 10Hz GPS Receiver x 1 (optional)
  • SIM800 or SIM5360 x1 (optional, plugged-in)




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