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Hardware UPGRADED
Our 2nd-Generation
AutoPi Telematics Unit CM4
The upgraded, innovative and robust AutoPi TMU CM4 is the future of edge devices for automotive and telematics. It allows users for more possibilities and comes with a wealth of benefits. Use the device to build complex solution and deploy them using Docker. Control the edge computer using our cloud platform and Tailscale to login directly on the device.
Upgraded with CAN-FD interface and Gigabit ethernet. The AutoPi TMU is built on the Raspberry Pi Compute Module 4 and comes with a dual CAN-FD interface with SocketCAN on top.
Broadcom BCM2711 Quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz
1GB LPDDR4 SDRAM / 8GB on board eMMC
Extendable with our HAT solutions
In stock | Order now! Ships tomorrow.
New generation hardware
Raspberry Pi Compute Module 4 telematics unit for vehicle and machine data
The 2nd Generation AutoPi TMU CM4 is built around Raspberry Pi Compute Module 4 (CM4) and updated for real installations. The platform adds a stronger automotive interface with dual CAN-FD channels, Gigabit Ethernet, and a more rugged mechanical design for long-running deployments in vehicles and machinery.
Gigabit Ethernet for faster local access and provisioning
Integrated security IC for protected keys and device identity
Upgraded automotive interface with dual CAN-FD channels
AutoPi TMU CM4 platform
Hardware features
engineered into the CM4 generation
AutoPi hardware is designed as a compact, vehicle-grade IoT unit that centralizes data from installed assets and vehicle networks. The goal is predictable integrations: CAN, OBD-II and IP connectivity in one device, plus a Linux environment that supports custom services and edge workloads.
Core capabilities
Core platform features of the AutoPi TMU CM4
The TMU CM4 is built for scalable deployments: from a handful of prototype vehicles to larger fleets and test rigs. The technical baseline is stable: Linux on Raspberry Pi CM4, CAN tooling via SocketCAN, and a deployment model that fits both R and D and operations.
Dual CAN-FD automotive interface
The device includes a 2x CAN-FD interface for higher bus throughput compared to classic CAN. The platform can be expanded with additional CAN interfaces depending on project needs. Diagnostics over IP (DoIP) is supported via add-on hardware.
Runs Linux on Raspberry Pi OS
AutoPi Core runs on a full Linux OS (Raspberry Pi OS). That matters in vehicle projects: standard tooling, predictable networking, and a familiar environment for Python, container workloads, and system services. SocketCAN integration supports common CAN workflows, including capture, filtering, and decoding.
Open-source software stack
The device runs an open-source software stack, making it practical to build custom services and integrations. Drivers and core implementations are maintained in the AutoPi GitHub repositories, which also keeps internal behavior inspectable in regulated or audit-heavy environments.
Compute and memory options
Broadcom BCM2711 quad-core Cortex-A72 (ARMv8) 64-bit SoC @ 1.5GHz provides the compute base. Variants support different RAM sizes (LPDDR4) and storage options through the CM4, which is relevant for local buffering, long sessions, and on-device processing.
4G/LTE connectivity for global deployments
Integrated modem supporting global 4G/LTE bands.
One device SKU can be used across regions, depending on network approvals and antenna setup.
Dual CAN-FD channels for higher throughput
CAN-FD increases payload and supports higher data rates than classic CAN.
Dual channels help separate networks or logging contexts (for example powertrain and body network).
OEM integration or aftermarket installation
Suitable for factory-style integration flows and for retrofit installations.
Installation approach depends on harnessing, power strategy, and access to CAN or OBD-II.
Power-safe behavior for data integrity
Smart Power Manager design supports controlled shutdown and reduces the risk of file corruption.
Useful in vehicles where ignition cycles and voltage drops are part of normal operation.
Expansion paths for custom projects
Supports extensions through USB, GPIO, BLE, and add-on hardware depending on variant.
External sensors and I/O can be added when the application needs more than vehicle network data.
CM4 variants for CPU, RAM, and storage
CM4 options support different RAM sizes and storage configurations.
That flexibility is relevant for buffering, local analytics, and on-device services.
CE and FCC compliance for deployment
The platform is designed with compliance in mind, including CE and FCC.
Integrated security element for device identity
Security IC supports protected key material and identity features.
Useful when devices run multiple applications or when secure onboarding is required.
Extendable
Extend the AutoPi TMU CM4 to any vehicle or machinery
Extension and adapter cables simplify installation across vehicle types. Heavy-duty adapters cover common SAE J1939 connectors used in trucks and industrial equipment. The standard adapter range includes OBD-II extensions, power cables, splitters, and vehicle-specific harnesses. Combined, these accessories support repeatable installation, stable data access, and compatibility across light-duty and heavy-duty systems.
See all adaptersFemale CAN Bus cable with open wires
OBD-II to dual DB9 adapter
Cummins-Komatsu Truck 12 PIN J1939 to 16 PIN OBD-II Adapter
Cummins 9 PIN J1939 (J1708) to 16 PIN OBD-II Adapter Cable
Caterpillar (538-5051) Truck 9 PIN J1939 to 16 PIN OBD-II Adapter
Expansion reworked
Upgraded expansion design
The CM4 generation consolidates earlier shield concepts into a single updated expansion approach. The result is a cleaner mechanical stack and fewer moving parts during installation. Extensions for sensing and I/O can raise the value of the same base unit across different vehicle programs.
Rear I/O
Dual USB and Gigabit Ethernet
Side access
SIM card, Micro-USB, Mini-HDMI slot
CM4 variants
More compute, more memory options
Processor: Broadcom BCM2711 quad-core Cortex-A72 (ARMv8) 64-bit SoC @ 1.5GHz
Memory: 1GB, 2GB, 4GB, or 8GB LPDDR4 (variant dependent)
Integrated hardware blocks
Hardware components inside the TMU CM4
Raspberry Pi Compute Module 4
The embedded CM4 provides the compute platform for data collection, connectivity, and on-device services. Linux-based tooling enables repeatable deployments and integration testing.
Button I/O input
A programmable button can be mapped to local actions such as service triggers, on-device state toggles, or installation workflows.
Security element
Secure key storage supports device identity and protected credentials. This reduces operational risk when multiple applications run on the same unit.
Bluetooth
Bluetooth 5.0 with Bluetooth Low Energy (BLE) supports peripherals such as sensors and beacons. BLE integration is common in retrofit projects where wiring is constrained.
Accelerometer and gyroscope
Embedded IMU hardware supports measurement of acceleration and rotational movement. Useful for harsh driving events, vibration analysis, and basic motion-aware behavior.
GNSS module and real-time clock
Position and speed tracking with A-GPS support. A native real-time clock improves timestamp stability during intermittent coverage and power cycles.
USB ports
External USB ports support peripherals such as WiFi adapters, storage, or cameras. USB can be expanded further with a hub depending on power budget and installation constraints.
4G modem and WiFi
The design supports cellular connectivity through an expansion board strategy (standard Mini PCI-Express socket). Local networking is available through 2.4GHz and 5GHz IEEE 802.11 b/g/n/ac wireless LAN.
GPIO header
The TMU CM4 includes an integrated 40-pin header (1.27mm pitch). This supports in-case HAT designs for additional I/O, sensors, or project-specific interfaces.
CAN bus and OBD chipset
On-board vehicle network interface supports CAN and CAN-FD workflows, plus OBD-II access. Typical projects involve SAE J1939 logging, OBD-II PID polling, and ECU communication paths that later connect to DBC decoding.
HDMI port
HDMI enables direct connection to a display for test rigs or in-vehicle HMI concepts. Common in prototype builds where local UI is part of the workflow.
Voice speaker
Playback of audio notifications based on device state, GNSS, motion signals, or vehicle data sources.
Something unclear?
Frequently asked questions
The AutoPi TMU CM4 is a smart telematics device built on the Raspberry Pi Compute Module 4 and the AutoPi board. Here are its main features:
Processor: Powered by a Broadcom BCM2711 Quad-core Cortex-A72 @ 1.5GHz for fast performance.
Momory: Starts with 1GB LPDDR4, but you can upgrade to 2GB, 4GB, or 8GB.
Storage: Comes with 8GB eMMC storage, upgradeable to 16GB or 32GB.
Modem: Has a 4G/LTE Cat 4 connection with global support.
GPS: Built-in GPS + A-GPS, compatible with GPS/GLONASS/BeiDou/Galileo/QZSS.
Power: Works with 12.5V car batteries and up to 35V for trucks, with a system to prevent battery drain.
Wireless: Includes WiFi (2.4GHz/5GHz) and Bluetooth 5.0 + BLE.
Security: Features hardware-based secure key management.
For all the technical details, check out the tmu cm4 datasheet. Want to know more about the device? Take a look at our autopi device guide.
The AutoPi TMU CM4 is perfect for fleet managers, car rental companies and tech enthusiasts who want to improve vehicle monitoring and management.
Installation is quite straightforward. It connects to your vehicle's OBD-II port, and detailed instructions are included. No special tools are required, but if you're unsure, a professional can guide you through the installation with you. We have an installation guide that you might find useful.
The AutoPi TMU CM4 works with most vehicles made after 1996 that have an OBD-II port. To check specific compatibility, refer to your vehicle's manual or consult our support team. The AutoPi TMU CM4 is prebuilt to be CAN Bus and J1939 ready.
The AutoPi TMU CM4 is packed with features like advanced vehicle telematics, real-time GPS tracking, remote diagnostics, and customizable alerts. It supports over-the-air updates and integrates smoothly with various software platforms.
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