Teensy 4.1 Triple CAN Bus Board with ETH and u-blox NEO-M8M GNSS

Product Description

This board is based around the Teensy 4.1 microcontroller and expands its capabilities with multi-CAN bus interfaces, Ethernet connectivity, and a full GNSS module. It is designed for high-performance embedded or vehicle-networked applications.

The Teensy 4.1 is an exceptionally powerful microcontroller development board built around an ARM Cortex-M7 core running at 600 MHz, making it one of the fastest MCUs available for Arduino-style prototyping. It offers an expansive feature set—including 8 MB of flash memory, support for a micro-SD card, a USB host port, and optional Ethernet connectivity—allowing it to scale well beyond hobbyist use into high-performance embedded systems. With 55 total I/O pins (including 42 breadboard-friendly) and both CAN 2.0 and CAN FD controllers built into the chip, it is particularly well suited for applications in robotics, industrial control, automotive networks, and data-heavy real-time tasks.

Key specifications and features:

The board includes one Teensy 4.1 module fitted on the carrier board.
It offers two Classic CAN ports plus one CAN FD port for flexible vehicle- or machine-network integration.
An Ethernet MagJack is included, enabling wired network connectivity.
Built-in switching-mode power supply (SMPS) on the board supports an external input of 7 V to 12 V, and includes reverse-polarity protection.
A Qwiic connector is fitted for I²C-compatible external sensors, providing easy expansion.
The GNSS module is the u-blox NEO-M8M. Interfaces for it include:
- UART (connectable via Serial 2 or Serial 3)
- I2C (connectable via I2C0 or I2C1)
- A 1PPS (pulse-per-second) signal routed to Teensy digital pin D35
The board features a USB-C connector for direct PC connection (monitoring/configuration).
It includes a coin-cell battery holder (for a CR1225 cell) to maintain backup GNSS functionality.
An SMA connector is provided to attach an external GNSS antenna.
LEDs on board include a red power LED, and a blue LED indicating the 1PPS GNSS pulse.
Although supplied with the NEO-M8M module, other GNSS modules (such as the NEO-M8T timing GNSS) can be fitted on request.

Use-cases and suitability:

This board is ideally suited for advanced automotive or vehicular telemetry applications. With two classic CAN 2.0B ports, one high-speed CAN FD channel, a built-in Ethernet port, and a high-precision GNSS module (the u-blox NEO-M8M), it enables developers to monitor, log and transmit rich vehicle-bus data in real time. For example, a fleet operator could deploy this board in a truck or bus to read multiple ECU networks simultaneously (using the triple CAN channels), log location, speed and route information via the GNSS, and send that data via Ethernet (or over an Internet gateway) for remote diagnostics and predictive maintenance. It also allows for injecting or simulating CAN FD messages to test next-generation EV systems.

In an industrial-automation or IoT gateway context, this board bridges legacy fieldbus networks and modern IP-based infrastructure. For instance, machinery or sensor arrays connected via CAN or CAN FD can feed data into the board, which preprocesses, filters or aggregates the information using the powerful 600 MHz Cortex-M7 core of the underlying Teensy 4.1. The Ethernet interface then delivers the processed data to local servers or cloud dashboards. The on-board GNSS adds another dimension—enabling geo-tagged machine telemetry, asset-tracking functions, or time-synchronised logging across distributed installations. In short, it’s a compact platform for bridging hard-real-time CAN networks with high-bandwidth, standard Ethernet and location aware data.

Documents

Software

Embedded Ethernet and Internet Complete

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