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 selected 24V mode but need to use a 5V fan:
- Connect the fan positive to the tool board's 5V power interface.
- Connect the fan negative to the GND terminal of the fan interface as usual.
- The tool board can still control the fan on/off via the original interface.
PWM Fan Control
- Available PWM Pins: GPIO24 and GPIO26 support PWM control.
- Important Notes:
- The GND of a PWM fan must be connected directly to the tool board GND.
- Do not use the GND from the fan interface or heater interface as the return path for a PWM fan.
🎯 Endstop Switch Configuration
Available Endstop Interfaces
| Pin | Function Type | Special Notes |
|---|---|---|
| GPIO20 | High-Voltage Endstop Port | Requires shorting with a jumper cap for use as a regular endstop. |
| GPIO16 | General-Purpose Endstop Port | No special requirements. |
| GPIO22 | General-Purpose Endstop Port | No special requirements. |
Configuration File Example
# Endstop Switch Configuration (Note the use of the ^ symbol)
[stepper_z]
endstop_pin: ^!SHT36:gpio16 # Using GPIO16 as endstop
# or
endstop_pin: ^!SHT36:gpio20 # Using GPIO20 as endstop (requires shorting jumper)
Configuration Key Points
- Required Symbol: The configuration must include the
^symbol to indicate pull-up. - Naming Convention: Adjust according to the actual tool board name (example uses SHT36).
- High-Voltage Endstop: When using GPIO20, do not connect the jumper cap if using a proximity switch!
⚠️ Important Reminders
- Always cut off the power before modifying hardware connections.
- A Klipper restart is required for configuration changes to take effect.
- If encountering issues, first check if the jumper cap settings are correct.
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