✓ Compatible Configuration
Standard switches can be safely used in combination with both 5V and Vmot-main switches.
Reason: Not voltage-dependent
pibot_cnc_laser_series:v496_pro:connect_limit_switches:start
Table of Contents
Connecting Limit Switches
The completed YAML example will be placed in the Documentation section.
Option A: Standard Limit Switch
Connecting a Standard Limit Switch
It can be connected to a regular switch or button. Such accessories have no polarity distinction and only possess on/off functionality. They can be connected to normally closed or normally open circuits.
🔌Wiring:
- Connect one wire of the switch to the Signal pin.
- Connect the other wire to the GND pin.
⚙️Configuration:
- Set the SW-VCC jumper to 5V.
- In your configuration YAML file, use the parameter
:lowto define the trigger logic (for either NO or NC configuration).
⚠️GPIO Special Notes:
- If you want to use GPIO.26 as a general-purpose input, you need to select the corresponding function on the GPIO.26 function switch.
- GPIO.2 requires adding
:pu(pull-up) to work properly.
Example diagram
If you want to use GPIO.26 as a general-purpose input, you need to select the corresponding function on the GPIO.26 function switch. For details, please refer to the relevant pinout and jumpers config section.
Example Yaml code
motor0: limit_neg_pin: gpio.39:low
control: safety_door_pin: NO_PIN reset_pin: gpio.39:low
probe: pin: gpio.2:pu:low toolsetter_pin: NO_PIN check_mode_start: true hard_stop: false
Option B: 5V Limit Switch
5V Powered Switch Configuration
A 5V powered switch offers higher precision than a standard switch. Please follow these connection and configuration steps carefully.
🔌Wiring Instructions:
- Set the SW-VCC jumper to 5V
- Connect the switch's VCC wire to the SW-VCC pin
- Connect the switch's Signal wire to the corresponding Signal GPIO pin
- Connect the switch's GND wire to the GND pin
⚙️YAML Configuration:
- Add
:lowto configure for normally open (NO) trigger - Remove
:lowto configure for normally closed (NC) trigger
⚠️Important Notes:
- GPIO.2 and GPIO.26 do NOT support this type of switch
- Double-check all connections before powering on
- Verify voltage settings to prevent damage to components
Example diagram
Example Yaml code
motor0: limit_neg_pin: gpio.39 limit_pos_pin: gpio.36:low
Option C: 12-24V Limit Switch
High-Voltage Industrial Switch Configuration (6V-24V)
Switches powered by Vmot-main voltage (6V to 24V) offer higher precision than 5V switches. These are commonly used in industrial applications. The input circuit sources current from SW-VCC: it leaves the board through the Signal terminal, so your sensor must pull that terminal down to GND. You must therefore use an NPN (sinking / open-collector) sensor, in either NO (Normally Open) or NC (Normally Closed) form. A PNP (sourcing) sensor cannot trigger these inputs.
🔌Wiring Instructions:
- Set the SW-VCC jumper to Vmot-Main
- Connect the switch's VCC wire to the SW-VCC pin
- Connect the switch's Signal wire to the corresponding Signal GPIO pin
- Connect the switch's GND wire to the GND pin
⚙️YAML Configuration:
- Add
:lowto configure for type of trigger - Remove
:lowto configure for type of trigger
⚠️Important Notes:
- Use an NPN (sinking) sensor. PNP (sourcing) sensors are not compatible and will simply never trigger.
- GPIO.2 and GPIO.26 do NOT support this type of switch
- Ensure Vmot-main voltage is within 6V-24V range
- On boards made before July 2026, connect a resistor of 2.2kΩ or higher in series with the signal terminal when using a 24V supply. Boards made after July 2026 already carry this resistor on the board and need no external one.
- Verify wiring before applying power
- Industrial switches provide better noise immunity and precision
Example diagram
On boards made before July 2026, connect a resistor of 2.2kΩ or higher in series with the signal terminal when using a 24V supply. Boards made after July 2026 already carry this resistor on the board.
Please refer to the technical manual provided by the specific product for wiring. Sometimes they refer to VCC as V+ and GND as V-.
Example Yaml code
motor0: limit_neg_pin: gpio.39 limit_pos_pin: gpio.36:low
Option D: Regarding Mixed Use
Switch Compatibility Guide
Understanding Mixed Usage Requirements
✗ Incompatible Combination
5V and Vmot-main switches cannot be used together in the same system.
Reason: Different voltage requirements (5V vs 6V-24V)
Key Technical Points:
- Standard switches operate independently of voltage levels
- 5V switches require precise 5V power supply
- Vmot-main switches operate on 6V-24V range
- Mixing different voltage types may cause system damage
pibot_cnc_laser_series/v496_pro/connect_limit_switches/start.txt · Last modified: by 127.0.0.1