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 built-in WiFi and Bluetooth supporting, being able to process collected data 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.

Features

• Dual-core fully programmable SoC
• Programmable WiFi and Bluetooth (BLE/SPP) communications
• G-force measurement and motion detection
• Geolocation with high accuracy and rate (requires external receiver)
• Access to all standard OBD-II PIDs, DTC, VIN from vehicle ECU
• CAN bus data sniffing
• Car battery voltage monitoring
• Data storage in internal Flash or microSD card (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 (16MB Flash, fully programmable)
• Built-in 802.11 b/g/n Wi-Fi and dual mode Bluetooth (classic and BLE)
• STM32 protocol co-processor
• ICM20948 motion sensor
• M8030 10Hz GNSS (external receiver, optional)
• xBee seat for cellular modules
• Integrated buzzer
• 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 (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 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).

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.

SIM Card

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.

MicroSD

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.

Buzzer

The internal buzzer is connected to ESP32’s GPIO25 and can be driven by PWM or DAC.

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

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.

Shipping List

• Freematics ONE+ x 1
• Micro USB cable x 1 (optional)
• GNSS Receiver x 1 (optional)
• Cellular Module x1 (optional, plugged-in)
• MicroSD card (optional, inserted)

Links

• Arduino Library
• Sample Arduino Sketches
• Quick Start Guide
• Developers Guide
• Tutorial: Setting up a vehicle tracking system on Linux box with Freematics ONE+
• Telelogger with Arduino as ESP-IDF Component