PiCAN2 - CAN Bus Interface with SMPS for Raspberry Pi

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The PiCAN2 brings reliable CAN‑Bus connectivity to your Raspberry Pi, leveraging the proven Microchip MCP2515 controller alongside the MCP2551 transceiver. Through either a DB9 connector or a convenient 3‑way screw terminal, it supports robust communication at speeds of up to 1 Mb/s, compatible with both standard and extended frames. What sets the SMPS version apart is its integrated 5 VDC 1 A switch‑mode power supply, enabling seamless operation from industrial or automotive power sources between 6 V and 20 V. This makes powering your Pi and its accessories as easy as plugging in a single supply, with built‑in reverse‑polarity protection and high efficiency.

Setup is straightforward: enable SPI, install the SocketCAN driver, and the board appears as can0 under Linux, with programming interfaces available in both C and Python. The board also includes a solder‑bridge for optional DB9 pinout adjustment, a 120 Ω termination resistor, LED status indicators, and footprints for serial LCDs or push‑button controls. Its four mounting holes conform to the HAT standard, and it offers an interrupt output on GPIO25 for real‑time CAN message handling.

That said, it's important to note that due to its 1 A SMPS rating, this variant isn’t recommended for powering a Raspberry Pi 4, which typically requires a 5 V 3 A supply—making it best suited for Raspberry Pi 2/3 or lightweight accessory setups. With its compact design, versatile connectivity, and built‑in power regulation, the PiCAN2 SMPS variant offers a streamlined solution for turning a Raspberry Pi into a dependable CAN‑Bus node in automotive, industrial, or lab environments.

Raspberry Pi 4/5 Compatibility

The SMPS version of the PiCAN board is currently not suitable for the Raspberry Pi 4/5. The RPi 4 & 5 require a higher amperage than supported by the SMPS.

Features

CAN v2.0 A/B at 1 Mb/s
High speed SPI Interface (10 MHz)
Standard and extended data and remote frames
CAN connection via standard 9-way sub-D connector or screw terminal
Compatible with OBDII cable
Solder bridge to set different configuration for DB9 connector
120Ω termination resistor
Serial LCD ready
LED indicator
Foot print for two mini push buttons
Four fixing holes, comply with Pi Hat standard
SocketCAN driver, appears as can0 to application
Interrupt RX on GPIO25
5VDC 1A SMPS to power Raspberry Pi and accessories from DB9 or screw terminal

Reverse polarity protection
High efficiency switch mode design
6 VDC to 20 VDC input range

Installing CAN and Python Tools

Documents

Connections (Pins) Used On 40-Pin Header

PiCAN2 Use of Raspberry Pi 40 Pin Header

The PiCAN2 CAN Bus interface board uses the highlighted pins on the Raspberry Pi's 40-pin header.

PiCAN2 CAN Bus HAT for Raspberry Pi - Getting Access To The 40-pin GPIO Header...

Recommended Literature:

Other Resources:

OBD2 And SAE J1939 Cables:

OBD2 16Pin to DB9 Adapter Cable - Use Board Settings for OBD-II
OBD2 16pin Cable Open End - Use Board Settings for OBD-II
SAE J1939 9pin Cable to DB9 Female - Use Board Settings for Standard CAN
SAE J1939 9pin Cable Open End - Use Board Settings for Standard CAN

Plastic Enclosure for PiCAN2 and Raspberry Pi 2/3

This is a two part clip together plastic enclosure for use with the PiCAN2 board and the Raspberry Pi 2/3. The enclosure is made from High Impact Polystyrene HIPS UL94-HB material. Mounting flanges allow for wall mounting.

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programming-the-raspberry-pi-getting-started-with-python-by-simon-monk.png

Programming the Raspberry Pi, Second Edition: Getting Started with Python

Learn to create inventive programs and fun games on your powerful Raspberry Pi―with no programming experience required. This practical book has been revised to fully cover the new Raspberry Pi 2, including upgrades to the Raspbian operating system. Discover how to configure hardware and software, write Python scripts, create user-friendly GUIs, and control external electronics. DIY projects include a hangman game, RGB LED controller, digital clock, and RasPiRobot complete with an ultrasonic rangefinder.

Set up your Raspberry Pi and explore its features
Navigate files, folders, and menus
Write Python programs using the IDLE editor
Use strings, lists, functions, and dictionaries
Work with modules, classes, and methods
Create user-friendly games using Pygame
Build intuitive user interfaces with Tkinter
Attach external electronics through the GPIO port
Add powerful Web features to your projects

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Product Videos

PiCAN2 CAN-Bus OBDII Data Logger for Raspberry Pi 02:14

This video is a demo of PiCAN2 OBDII data logger for the Raspberry Pi. More info and python code on this project http://www.skptechnology.co.uk/pican2-obdii-data-logger-for-raspberry-pi/

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PiCAN2 - CAN Interface for Raspberry Pi With SMPS

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