Endstop Related

Microswitch Endstop

Notes on Three-Wire Microswitch Endstops

Important Notice

• FLY Mainboard Users Please Note: Three-wire microswitch endstops cannot be directly connected to FLY mainboards because the endstop interface on the mainboard already provides 5V power. Direct connection will cause a 5V short circuit, potentially burning out the mainboard, host computer, drivers, and other equipment!

• Solution
  • Cut the 5V Wire: Cut the corresponding 5V wire (usually the red wire, please verify the actual color) in the three-wire endstop's XH2.54 connector and insulate it with electrical tape to prevent short circuits.

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Microswitch Endstop Wiring Method

Precautions

• Strongly Recommended: Use the Normally Closed (NC) contact (to prevent crash incidents in case of wire breakage).

• Connection Requirements:

Mainboard Terminal	Function	Connection Requirement
5V	Power	🔌 Leave unconnected (floating)
GND	Ground	✅ Must be connected
S	Signal	✅ Must be connected

• Testing Procedure:

1. Set the multimeter to the continuity test mode (buzzer icon).

2. Test the microswitch:

   • Not Pressed: There should be continuity (buzzer sounds) between the Normally Closed (NC) terminal and the Common (C) terminal.
   • Pressed: There should be no continuity (silent) between the Normally Closed (NC) terminal and the Common (C) terminal.

3. If the result is opposite:

   • Check if the Normally Open (NO) contact is mistakenly used.
   • Check for poor contact.
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Configuration Instructions

• Pull-up Resistor Requirement:

  • Most printers require enabling the pull-up resistor. The ^ symbol must be added before the pin name.

• Normally Closed Endstop Configuration:

  • When using a Normally Closed (NC) endstop, the ! symbol must be added.

• Reference configuration below:

  [stepper_x]
  endstop_pin: ^!PD9

TAP

Wiring Instructions

Important Notice

• This tutorial uses the BL-Touch interface on SHT36-V2 for demonstration.
• Some TAP devices support 12V or 24V, but it is recommended to use 5V power supply (safer).
• The middle signal port of BL-Touch cannot be used as an endstop port!!!

Mainboard Terminal	Function	Connection Requirement
5V	Power	✅ Must be connected
GND	Ground	✅ Must be connected
S	Signal	✅ Must be connected

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Reference Configuration

• Pull-up Resistor Requirement:
• Most printers require enabling the pull-up resistor. The ^ symbol must be added before the pin name.

[stepper_z]
endstop_pin: probe:z_virtual_endstop
# position_endstop: -0.5

[probe]
pin: ^sht36:PC15             # Signal interface
x_offset: 0                  # X-axis - Sensor offset relative to nozzle
y_offset: 0                  # Y-axis - Sensor offset relative to nozzle
#z_offset: 0                 # Z-axis - Sensor offset relative to nozzle
speed: 3.0                   # Leveling speed
lift_speed: 5                # Probe lift speed
samples: 3                   # Number of samples
samples_result: median       # Result calculation method (default median)
sample_retract_dist: 3.0     # Leveling retract distance
samples_tolerance: 0.075     # Sample tolerance (Note: too small a value may increase sampling attempts)
samples_tolerance_retries: 3 # Retry count for tolerance exceedance
activate_gcode:
    {% set PROBE_TEMP = 150 %}
    {% set MAX_TEMP = PROBE_TEMP + 5 %}
    {% set ACTUAL_TEMP = printer.extruder.temperature %}
    {% set TARGET_TEMP = printer.extruder.target %}

    {% if TARGET_TEMP > PROBE_TEMP %}
        { action_respond_info('Extruder temperature target of %.1fC is too high, lowering to %.1fC' % (TARGET_TEMP, PROBE_TEMP)) }
        M106 S255
        M109 S{ PROBE_TEMP }
        M106 S26
    {% else %}
        # Temperature target is already low enough, but nozzle may still be too hot.
        {% if ACTUAL_TEMP > MAX_TEMP %}
            { action_respond_info('Extruder temperature %.1fC is still too high, waiting until below %.1fC' % (ACTUAL_TEMP, MAX_TEMP)) }
            TEMPERATURE_WAIT SENSOR=extruder MAXIMUM={ MAX_TEMP }
        {% endif %}
    {% endif %}

Photoelectric Endstop

Important Notice

• This tutorial uses EE-SX670WR.
• Sensor Type: NPN Normally Closed Switch
• The photoelectric switch uses 5V power supply.
• For voltages exceeding 5V (e.g., 12V or 24V), please refer to the proximity switch tutorial below.

Wiring Instructions

Mainboard Terminal	Function	Connection Requirement
5V	Power	✅ Must be connected
GND	Ground	✅ Must be connected
S	Signal	✅ Must be connected

• EE-SX670WR Wiring Instructions

• It is recommended to connect the Normally Closed (NC) wire to the blue wire (GND)!

  Photoelectric Switch	Function	Connection Requirement
  Brown	Power	✅ Must be connected
  Blue	Ground	✅ Must be connected
  Black	Signal	✅ Must be connected
  Pink	Normally Closed	Connect to GND to use Normally Closed mode

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Configuration Instructions

• Pull-up Resistor Requirement:

• Most printers require enabling the pull-up resistor. The ^ symbol must be added before the pin name.

• Reference configuration below:

[stepper_x]
endstop_pin: ^PD9

Proximity Switch

Critical Information

• Using the Omron proximity switch TL-Q5MC2-Z as an example. Please note before operation:
• Sensor Type: NPN Normally Closed Switch
• Required Material: You need to purchase a BAT85 model diode.

Wiring Steps

1. Diode Installation

• Connect the black end (cathode) of the diode to the sensor's signal wire.
• Connect the other end (anode) to the mainboard's signal interface.

2. Insulation Treatment

• It is strongly recommended to use heat shrink tubing or electrical tape to insulate exposed wire ends to prevent short circuits with other equipment.
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Reference Configuration

• Pull-up Resistor Requirement:
• Most printers require enabling the pull-up resistor. The ^ symbol must be added before the pin name.
• Reference configuration below:

[probe]
pin: ^PC0
x_offset: 0
y_offset: 25.0
z_offset: 0

Endstop Status Check

Preparation

• Preparation and Initial Check
• With the printer safely powered off, slowly move the printhead to the center of the machine, then power on.
• Open the web console and enter the following command to verify endstop status:

QUERY_ENDSTOPS

• If wiring and configuration are correct, all endstops should show as open status.
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Testing

• Press and hold one of the endstop switches (do not release), then execute the command below again:

QUERY_ENDSTOPS

• The status of the pressed endstop should now change to TRIGGERED (e.g., if the Y endstop is pressed, its status should change from OPEN to TRIGGERED).
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Result Interpretation

• Status did not change: Please check the endstop switch wiring and whether the Pin defined in the configuration is correct.
• Inconsistent triggering: Please check if the ^ symbol is present before the Pin in the configuration (e.g., ^PC0). This symbol enables the pull-up resistor; its absence may cause triggering issues.
• Status is opposite: Please check if the ! symbol is present before the Pin.
  • If it exists, try removing it (e.g., change ^!PD9 to ^PD9).
  • If it does not exist, try adding it (e.g., change ^PD9 to ^!PD9).

Extended Functionality

If your printer does not use physical endstop switches, please refer to the No Endstop Usage Guide