Communication Board
The main communication board is a compact, versatile solution designed to optimize control and communication in Klipper-based systems. This small board can be connected to the Klipper host (SBC) via USB or CAN. The board can also be used as a USB-to-CAN bridge with a USB connection, making it an ideal choice for integrating CAN toolhead boards into Klipper.
The board allows the connection of up to 10 hardware buttons connected via flexible FFC/FPC flat cables (8-pin, 0.5 mm pitch). The buttons are organized in two daisy chains, each supporting up to 5 buttons. This architecture ensures simple and clean cabling that is also flexible and expandable.
At the heart of the board is a powerful STM32F072 MCU with native hardware support for CAN. This ensures reliable and fast communication, especially in advanced Klipper 3D printers.
Therefore, this main communication board is a central component for advanced control and communication tasks in modern Klipper systems and offers a wide range of applications thanks to its compact design and powerful features.
Features
- 2x 5 buttons with NeoPixel LEDs (daisy chain via FFC/FPC flat cables 8-pin, 0.5 mm pitch)
- STM32F072 MCU
- SWD programming interface
- I2C and SPI interfaces
- USB interface with ESD protection
- CAN interface with ESD protection
- Katapult (Bootloader) support with status LED
- Reset button on the board
- BOOT0 button on the board (DFU mode)
- Supports 3.3V/4V CAN transceivers
- Onboard NeoPixel LED for status indication
- Level shifter for NeoPixel LEDs
- 5V power supply via USB
Possible communications
- USB → CAN (USB-to-CAN Bridge)
- USB → SPI
- USB → I2C
- USB → Gcode-Buttons
- CAN → Gcode-Buttons
- CAN → SPI
- CAN → I2C
Pinout
