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Freematics ONE+

Freematics ONE+
Freematics ONE+ Freematics ONE+ Freematics ONE+ Freematics ONE+ Freematics ONE+ Freematics ONE+
Brand: Freematics
Product Code: ONE+
Availability: In Stock
Price: US$45.00

Available Options

Internal Flash Size:

Cellular Module:

GNSS (External):


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Freematics ONE+ is our most powerful Arduino programmable vehicle telematics prototyping platform, in form of a OBD dongle that plugs into a vehicle’s OBD port and works as a standalone data logging or edge computing device having access to vehicle’s ECU, high-rate GNSS, 9-DOF motion sensor and possibly some external sensors. Collected data can be processed in real-time, stored in internal Flash or microSD card and transmitted via BLE, WiFi or cellular network. Freematics ONE+ comes with SDK (Arduino libraries) and reference firmware (Arduino sketches) which are being active maintained.


  • Dual-core Arduino programmable SoC
  • High performance WIFI and Bluetooth communications
  • G-force measurement and motion/orientation detection
  • Geolocation obtaining in high accuracy and rate
  • 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 64GB)
  • Real-time data transmission over WiFi or cellular network
  • Working out-of-box as OBD/GPS/motion data logger (on microSD card)


Hardware Facts


  • Espressif ESP32 main controller (fully programmable)
  • Built-in 802.11 b/g/n HT40 Wi-Fi transceiver
  • Built-in dual mode Bluetooth (classic and BLE)
  • STM32 protocol co-processor
  • MPU-9250 motion sensor
  • M8030 10Hz GNSS (external receiver)
  • xBee seat for pluggable wireless communication modules (SIM800L or SIM5360 for cellular network)
  • Enclosure dimensions: 60x48x20mm
  • Typical power rating @80Mhz: 20mA (WIFI inactive) / 50mA (WIFI active) / 180mA (3G active)


Physical Interfaces

  • OBD-II male connector
  • microUSB port
  • microSD card slot
  • SIM card slot (when cellular module is present)
  • I/O socket (Molex)
  • xBee socket (onboard)


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


External I/O

Freematics ONE+ has an external I/O socket on its enclosure. The 4-pin socket contains of 2x GPIO (from ESP32), VCC and GND.  A 2.54 Molex connector is used for wiring. The line definition of the connector is as following.

  1. GND
  2. GPIO32 / Rx2 (ESP32)
  3. VCC (5V)
  4. GPIO33 / Tx2 (ESP32)



Freematics ONE+ supports high-accuracy geolocation positioning external GNSS receiver connected to the 4-pin I/O connector. The optional M8030 10Hz GNSS receiver provides high accuracy (up to 2 meters) and high update rate (10Hz). The receiver comes with a 1.5m long cable.

In case SIM5360 cellular module is included, the module’s integrated GNSS (1Hz) can also be used for geolocation positioning, with an external GNSS antenna attached via SMA connector.

Cellular Module

Cellular module is attached to Freematics Esprit through the onboard xBee socket. 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 cellular antenna inside enclosure. To further improve cellular network signal level in areas with poor coverage, an optional external antenna can be attached via a SMA connector. By average this boosts signal by 3-6dB and reduce heat generated by the cellular module under poor signal level. Please note this option is unavailable if SIM5360 GNSS antenna is required which is also attached via SMA connector.


Freematics ONE+ has a microSD slot under the side cover. The card reader is connected to ESP32 through SPI. Standard Arduino SD library can be used for microSD card access.

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. It is subject to change and may not always be up-to-date.


Freematics ONE+ vs Freematics ONE

  Freematics ONE+ Freematics ONE
Programmable Processor 32-bit Dual-Core @ 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)
External I/O 2x 3.3V GPIO for digital I/O, analog input, serial UART 2x 5V digital I/O or analog input
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 of our massive accomplished work. We have been developing and maintaining a dedicated Arduino library for easy access to all hardware resources and a set of fully functional reference Arduino sketches for this product. So there is no need to start from scratch. As long as you have some basic knowledge about Arduino, you are good to go. Together with our Freematics Arduino Builder which allows configuring, compiling and uploading Arduino sketches in one simple GUI, we intend to bring the best out-of-box experience for non-professional developers. If you are a pro, we recommend PlatformIO IDE as development environment and our reference code is organized as PlatformIO projects as well, though you can still use Arduino IDE or Arduino makefile with ESP-IDF. For more information about development, please refer to the Developers Guide.


Branding & Customization

We provide firmware customization and technical support for application integration.

We supply white label or custom label enclosure. We can also supply head-less version (without OBD connector) for hard-wiring and permanent installation. With a MOQ, we can customize PCB and add/remove features to adjust the cost. Please contact for free consultation.


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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