Freematics ONE+ is a powerful Arduino programmable vehicle telemetry prototyping platform in form of a OBD dongle that plugs into a vehicle’s OBD port and works as a standalone smart device which can communicate with vehicle’s ECU. It integrates motion sensor and can extend with GNSS receiver or external sensors. 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 cellular network. Freematics ONE+ comes with an actively maintained Arduino library and ready-to-go Arduino sketches and open-source telemetry server software.

Features

Dual-core Arduino programmable SoC with built-in WiFi and Bluetooth
Access to all standard OBD-II PIDs, DTC, VIN from vehicle ECU
CAN bus data sniffing
Geolocation with high accuracy and update rate (requires external receiver)
G-force measurement and motion detection
Car battery voltage monitoring
Massive data storage (microSD up to 32GB)
Real-time data transmission over WiFi or cellular network
Configuring and monitoring from mobile device app via BLE

Hardware Facts

Specifications

Espressif ESP32 main controller (4MB Flash, fully programmable)
Built-in 802.11 b/g/n Wi-Fi and dual mode Bluetooth (classic and BLE)
ICM20948 motion sensor
M8030 10Hz GNSS (external receiver, optional)
Enclosure dimensions: 60x48x20mm
Typical power rating @80Mhz: 20mA (WiFi inactive) / 50mA (WiFi 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 for cellular module

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. The 4-pin socket contains 2x I/O pins (ESP32’s GPIO26 and GPIO34), VCC (controllable by ESP32’s GPIO12) and GND, as following.

With a Molex to 2.54 Dupont connector conversion cable, external sensors or controller can be easily connected. On the Dupont connector side, black for GND, red for VCC, white for GPIO34 and green for GPIO26.

GNSS

Freematics ONE+ supports external GNSS receiver connected to the 4-pin I/O connector. The optional u-blox M10 GNSS receiver provides high accuracy (up to 1.5 meters) and high update rate (up to 10Hz). The receiver comes with a 1.5m long cable.

Bluetooth

Freematics ONE+ has built-in dual-mode Bluetooth capability and can work with Freematics Controller App via BLE when datalogger sketch or telelogger sketch uploaded.

Cellular Module

Cellular module is installed in Freematics ONE+ through onboard xBee socket. We provide several options for cellular modules. Following chart compares the 3 types currently available.

	SIM7600E-H	SIM7600A-H	SIM7070G
Mobile Network Bands	LTE-TDD B38/B40/B41 LTE-FDD B1/B3/B5/B7/B8/B20	LTE-FDD B2/B4/B12	CAT-M B1/B2/B3/B4/B5/B8 /B12/B13/B14/B18/B19/B20 /B25/B26/B27/B28/B66/B85
	UMTS/HSPA+ B1/B5/B8 GSM/GPRS/EDGEB3/B8	UMTS/HSPA+ B2/B5	CAT-NB B1/B2/B3/B4/B5/B8 /B12/B13/B18/B19/B20 /B25/B26 /B28/B66/B71/B85
Data Transfer Speed	LTE CAT4: 50Mbps(UL) 150Mbps(DL) HSPA+: 5.76Mbps(UL), 42Mbps(DL) UMTS: 384Kbps EDGE: 236.8Kbps GPRS: 85.6Kbps	LTE CAT4: 50Mbps(UL) 150Mbps(DL) HSPA+: 5.76Mbps(UL), 42Mbps(DL) UMTS: 384Kbps EDGE: 236.8Kbps GPRS: 85.6Kbps	CAT-M: 589Kbps(DL)/1119Kbps(UL) CAT-NB: 127Kbps(DL)/158.5Kbps(UL) EGPRS: 296Kbps(DL)/236.8Kbps(UL)
Regions	Europe, Asia, South America, Australia	North America （AT&T Certified), Australia (Telstra)	Global

SIM Card

A micro SIM card is needed for using cellular network and is inserted as shown below.

MicroSD

Freematics ONE+ has a microSD slot under the side cover which is connected to ESP32 via 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.

Schematic

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, WiFi and cellular networking	OBD-II/GPS/MEMS access
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

Development

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.