Freematics ONE+ is a 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 car connected smart device. It is based on ESP32 with WiFi and Bluetooth and integrates 9-axis motion sensor. Collected data can be processed in real-time with its dual-core CPU, stored in internal Flash or microSD card and transmitted via BLE, WiFi or over cellular network. Freematics ONE+ comes with an actively maintained Arduino library and ready-to-go Arduino sketches and open-source telemetry server software.
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.
Freematics ONE+ has an external I/O socket containing 2x GPIO (ESP32's GPIO32/GPIO33), VCC (controlled via GPIO15) and GND.
External analog or digital sensors can be connected with a Molex to 2.54 Dupont conversion cable (optional accessory).
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.
SIM5360 and SIM7600 cellular modules have built-in GNSS which requires an external antenna with SMA connector.
Cellular module is attached to Freematics ONE+ through its onboard xBee socket. We provide several options of cellular modules for different networks. Following chart compares the 3 types of cellular modules currently available.
|Regions||Europe, Asia, Australia*||Europe, Asia, Australia*||US, Canada, Australia*|
* Australia has both 3G bands in operation by different operators. Complete worldwide 3G band information is here.
A microSIM card is needed for using cellular network and is inserted as shown below.
Global SIM cards like Hologram IoT SIM card are supported.
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.
The internal buzzer is connected to ESP32’s GPIO25 and can be driven by PWM or DAC.
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+||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,
WiFi and cellular networking
|WiFi||Built-in 802.11 b/g/n (SDK)||N/A|
|Bluetooth||Built-in BLE+BT (SDK)||Optional BLE 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/LTE bee module, direct access (UART)||GSM/GPRS bee module|
|Program Space||4MB or 16MB Flash + 520KB RAM||32KB Flash + 2KB RAM|
|Data Storage||microSD or internal Flash||microSD|
|Device 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 cellular network||Local data logging and simple data transmission over cellular network|
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.
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.