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Tool Board FAQ

🌀 Fan Control Issues​

Voltage Selection and Wiring​

  • Voltage Control Method: The fan interface controls on/off by switching the negative (GND) connection.
  • Dual Fan Interface: The board has two fan interfaces, but only one voltage can be selected for both via a jumper cap.
    • 24V Mode: Suitable for 24V fans.
    • 12V Mode: Suitable for 12V fans.
    • 5V Mode: Suitable for 5V fans.

Special Wiring Cases​

  • If you select 24V mode but need to use a 5V fan:
    • Connect the fan's positive wire to the tool board's 5V power interface.
    • Connect the fan's negative wire to the GND terminal of the fan interface.
    • The tool board can still control the fan's on/off via the original interface.

PWM Fan Control​

  • Available PWM Pins: GPIO24, GPIO26 support PWM control.
  • Important Notes:
    • The GND of a PWM fan must be connected directly to the tool board's GND.
    • Do not use the GND from the fan interface or heater interface as the return path for a PWM fan.

🎯 Limit Switch Configuration​

Available Limit Interfaces​

PinFunction TypeSpecial Notes
GPIO20High-Voltage Limit PortRequires shorting the jumper cap for use as a regular limit.
GPIO16General-Purpose Limit PortNo special requirements.
GPIO22General-Purpose Limit PortNo special requirements.

Configuration File Example​

# Limit Switch Configuration (Note the use of the ^ symbol)
[stepper_z]
endstop_pin: ^!SHT36:gpio16    # GPIO16 as limit
# Or
endstop_pin: ^!SHT36:gpio20    # GPIO20 as limit (requires jumper shorted)

Configuration Key Points​

  1. Required Symbol: The configuration must include the ^ symbol to indicate pull-up.
  2. Naming Convention: Adjust according to the actual tool board name (example uses SHT36).
  3. High-Voltage Limit: When using GPIO20, do not connect the jumper cap if using a proximity switch!

⚠️ Important Reminders​

  1. Always disconnect power before modifying hardware connections.
  2. A Klipper restart is required for configuration changes to take effect.
  3. If encountering issues, first check if the jumper cap settings are correct.
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