BigTreeTech Octopus Control Board

BigTreeTech Octopus 3D Printer Control Board

This is one sweet board, perfect for a Voron build.

• ARM Cortex-M4 STM32F446ZET6 32-bit microcontroller at 180MHz
• Support for Klipper and Marlin firmwares
• Interfaces for Raspberry Pi (USB and UART by GPIO)
• Up to 4 hotends available
• Integrated DCDC to provide 12V(4A), 5V(8A) and 3.3V(1A) power supply
• Up to 6 controllable fans and 2 without control with the possibility of voltage selection (Vin, 12V and 5V)
• Protection against short circuit on fans, something very important since it is one of the most common problems
• USB-C connector that allows serial emulation to print using USB
• Compatibility with almost any screen
• High performance MOSFETs, improve heating speed and efficiency
• Protection fuses easily replaceable
• Double motor output for the Z axis
• Improvements in the bootloader, supporting the update by USB (recommended) and DFU (advanced users)
• 32K EEPROM (AT24C32)
• Connectors for RGB LEDs and Neopixel
• Connector for WiFi interface 
• PT100 interface (requires INA8 amplifier 26AIDR welded to plate in socket)
• Protection against short circuit in thermistors, another great improvement applied to the fans. It allows reusing these pins for other tasks with a pin that bypasses these protections
• BLTouch support and the like with a connector intended for them and usable by other ABL systems. The PROBE port was added extra protection with an optocoupler so as not to need to use a BAT85 diode
• CAN BUS via ethernet connector for future expansion modules
• SPI BUS expansion port for SPI modules such as MAX31865
• I2C BUS expansion port for I2C modules
• Support for modules Relay and UPS
  

(source: https://3dwork.io/en/btt-octopus/ - review for a major cheat sheet on this board!)