BigTreeTech EBB 42 CAN v1.2

The BigTreeTech EBB 42 CAN v1.2 is a compact, feature-rich toolhead board designed to simplify wiring and enhance performance in 3D printers—especially those running Klipper firmware. Here’s a breakdown of its standout features:

🔧 Hardware & Connectivity

• CAN Bus & USB Communication: Offers both CAN and USB interfaces for flexible, simplified wiring.
• Microcontroller: Powered by an ARM Cortex-M0+ STM32G0B1CBT6 running at 64MHz.
• Onboard Stepper Driver: Integrated TMC2209 in UART mode for quiet, precise motor control.
• Accelerometer: Built-in ADXL345 for input shaping and vibration analysis.

🌡️ Thermal & Sensor Support

• Thermistor Compatibility: Supports 100K NTC, PT1000, and PT100/PT1000 via onboard MAX31865 (2-wire or 4-wire selectable).
• Protection Circuits:
• Thermistor protection to prevent MCU damage from heater leakage.
• Anti-flyback diodes on heater and fan ports.
• ESD protection on USB port.
• Reverse polarity protection on power input.

🛠️ Expansion & DIY Friendliness

• Interfaces: Endstop, I2C, Probe, RGB, CAN, USB, and PT100/PT1000.
• Firmware Updates: BOOT and RESET buttons for easy DFU mode flashing via USB.
• CAN Termination: Selectable 120Ω resistor via jumper cap.
• Power Options: USB jumper cap isolates USB 5V from main DC-DC circuit.

📐 Physical Specs

• Size: 40mm x 40mm with 31mm x 31mm mounting holes (M3).
• Voltage: 12V–24V input, 3.3V logic.
• Fan Outputs: Two fan ports (FAN0, FAN1), each rated for 1A (1.5A peak).
• Heater Output: Supports up to 5A for hotend.