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Button Signal Trigger Configuration

Functional Overview​

The physical buttons on the FLY-LLL PLUS buffer support sending signals to Klipper. When you press a button, the buffer outputs a level signal on the specified pin. The Klipper motherboard can detect these signals and execute preset G-code commands, enabling more flexible print control.

Signal Output Description​

ButtonOperation MethodSignal Output (Buffer Pin)Signal TypeDuration
Feed Button (FEED)ClickFEED pin outputs a high-level pulseHigh LevelAutomatically returns to low level after 3 seconds
Feed Button (FEED)Long PressContinuous feedingHigh LevelUntil the button is released
Retract Button (RETRACT)ClickRETRACT pin outputs a low-level pulseLow LevelAutomatically returns to high level after 3 seconds
Retract Button (RETRACT)Long PressContinuous retractionLow LevelUntil the button is released

Wiring Method​

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Wiring Steps​

  1. Prepare Connection Cables: Use Dupont wires or dedicated connection cables.
  2. Connect Signal Wires:
    • Connect the buffer's FEED pin to any free limit switch port or GPIO pin on the motherboard.
    • Connect the buffer's RETRACT pin to another free limit switch port or GPIO pin on the motherboard.
    • Connect the buffer's GND pin to the motherboard's ground pin (GND).
  3. Record Pin Numbers: Note down the pin numbers connected on the motherboard side (e.g., PD4, PD5) for subsequent configuration.

Tip: It is recommended to use the limit switch ports on the motherboard (usually three-pin interfaces). Pay attention to the order of the signal wires when connecting to avoid reverse connection.

Klipper Configuration​

1. Basic Configuration Example​

Add the following configuration sections to the Klipper configuration file (e.g., printer.cfg):

[gcode_button Trigger Feed]
pin: ^PD4          # Replace with your actual connected pin (e.g., PD4)
press_gcode:
    RESPOND MSG="Trigger Feed"
    # Add custom feed G-code here

[gcode_button Trigger Retract]
pin: ^!PD5          # Replace with your actual connected pin (e.g., PD5)
press_gcode:
    RESPOND MSG="Trigger Retract"
    # Add custom retract G-code here

2. Configuration Parameter Details​

[gcode_button Button Name]  # Custom button name for easy identification
pin: ^!PD4               # Pin configuration
# ^  Indicates using an internal pull-up resistor (commonly used for button signals)
# !  Indicates signal inversion (used when low-level is active)
# PD4 Replace with your actual connected pin number

press_gcode:             # G-code sequence executed when the button is pressed
    # Add any valid G-code commands here
    # For example: control extruder feed/retract, pause printing, execute macros, etc.

3. Common G-code Examples​

Controlling Extruder Feed/Retract​

[gcode_button Manual Feed]
pin: ^!PD4
press_gcode:
    RESPOND MSG="Manual Feed 10mm"
    G91              # Switch to relative coordinate mode
    G1 E10 F300      # Extrude 10mm, feed speed 300mm/min
    G90              # Switch back to absolute coordinate mode
    RESPOND MSG="Feed Complete"

[gcode_button Manual Retract]
pin: ^!PD5
press_gcode:
    RESPOND MSG="Manual Retract 5mm"
    G91              # Switch to relative coordinate mode
    G1 E-5 F300      # Retract 5mm, speed 300mm/min
    G90              # Switch back to absolute coordinate mode
    RESPOND MSG="Retract Complete"
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