UCAN V1.0 USB to CAN Bus Adapter - STM32F072 Type-C to 3-Pin Terminal

Specifications

• Microcontroller: STM32F072C8T6

• Host Interface: USB Type-C (USB 2.0 Full Speed)

• CAN Interface: 3-Pin Screw Terminal (3.5 mm or 3.81 mm pitch)

• Terminal Pinout: CAN_L, CAN_H, GND

• Operating Voltage: 5V (Powered via USB)

• Logic Level: 3.3V internal logic

• Dimensions: 63.5mm x 15.5mm

• Mounting Cutout Spacing: 54.5mm

• Firmware Compatibility: Cangaroo (Windows), SocketCAN (Linux), Klipper CAN bridge

Key Applications and Projects

• Klipper 3D Printers: Serving as the central USB-to-CAN bridge on a Raspberry Pi to communicate with lightweight CAN toolhead boards (like the BTT EBB36), eliminating massive, heavy wiring harnesses running to the extruder.

• Automotive Diagnostics: Interfacing with a vehicle's OBD-II port to sniff, inject, or log real-time CAN bus data from the Engine Control Unit (ECU).

• Industrial Automation: Troubleshooting and monitoring custom PLC networks or servo motor arrays operating on the CAN protocol.

Unlock New Capabilities (Project Evolution)

• The Single-Wire Toolhead Upgrade: Sick of wire breaks causing your 3D printer to fail? Evolve your build to the modern era! Plug this UCAN adapter into your Raspberry Pi via USB. Run just four wires (24V Power, Ground, CAN_H, CAN_L) up to a CAN-enabled toolhead board on your extruder. The UCAN handles all the complex data routing via SocketCAN, leaving you with a beautifully clean, lightweight, and break-resistant 3D printer!

⚠️ Safety Warning: Ensure the CAN High (H) and CAN Low (L) lines are not shorted to high-voltage power rails (above 24V) to avoid damaging the transceiver.

Pin Mapping:

• CAN H: Connect to the CAN High line of the bus.
  
• CAN L: Connect to the CAN Low line of the bus.
  
• GND: Connect to common ground (highly recommended for signal integrity).

Package Includes:

• 1x UCAN V1.0 USB to CAN Adapter Board (Fully assembled with USB-C and screw terminals)

FREQUENTLY ASKED QUESTIONS (FAQ)

1. What does this board actually do? It translates standard USB serial data into the differential signal protocol required by a CAN (Controller Area Network) bus, allowing your computer to talk to CAN devices.

2. What chip does the UCAN V1.0 use? It utilizes an STMicroelectronics STM32F072C8T6 ARM Cortex-M0 microcontroller.

3. Is this compatible with Klipper for 3D printing? Yes! This is widely used in the Klipper community as a USB-to-CAN bridge, allowing a Raspberry Pi to control CAN toolhead boards.

4. Does this work with Linux / Raspberry Pi? Yes. With the correct firmware (like CANable/slcan), it shows up as a native network interface (e.g., can0) via SocketCAN in Linux.

5. Does it work with Windows? Yes. It can be flashed with firmware compatible with Windows-based CAN sniffer software like Cangaroo.

6. What kind of USB cable do I need? It requires a standard USB Type-C data cable. Ensure your cable supports data transfer, as "charge-only" cables will not work.

7. What do the labels on the back mean? The back indicates the screw terminal pinout: CAN_L (CAN Low), CAN_H (CAN High), and GND (Ground).

8. Does this board have a 120-ohm termination resistor? Most CAN bridge boards like this feature a 120-ohm termination resistor across CAN_H and CAN_L by default, as the bridge usually acts as one physical end of the CAN bus.

9. What are the small silver pads on the back for? The pads labeled RX, TX, CK, DO, RES, BO, etc., are exposed debugging and flashing pins (UART and SWD). They are only used by advanced developers to flash bootloaders or debug the STM32 chip directly.

10. Do I need to supply external power to the screw terminals? No. The UCAN board and its transceiver are powered entirely by the 5V provided through the USB-C connection.

11. Can I use this to flash a firmware update to my car's ECU? While the hardware is capable of transmitting CAN packets to an OBD-II port, ECU flashing requires highly specific proprietary software and knowledge. Use at your own risk.

12. What kind of wire should I use for CAN_H and CAN_L? You must use twisted-pair wire. Twisting the High and Low wires together is critical for rejecting electromagnetic interference on a CAN bus.

13. Are the mounting holes fully enclosed? No, they are semi-circular cutouts (castellations) on the edges of the board. You mount it by trapping the edge of the board under the head of an M3 screw.

14. What are the physical dimensions? The board is 63.5mm long (including the connectors) and 15.5mm wide.

15. Does it include the USB cable? No, this listing is for the UCAN V1.0 PCBA only. Cables must be purchased separately.