Sometimes endstops can cause some hard-to-find issues. If you have a Cohesion3D or other Smoothie based controller you can troubleshoot your endstops from within the LightBurn console.
There are a few prerequisites for this to work. Your controller must be G-code based and be supported by LightBurn, LightBurn must be able to communicate with the controller, and you must manually actuate and deactuate the endstops.
There is a command that allows you to debug this kind of situation : the “M119” G-code. When M119 is entered in to the console the controller will answer with the status of each endstop that will look something like this :
X min:1 Y min:0 Z min:0
The above output means that the X endstop IS pressed and the Y and Z endstops are NOT pressed.
Now let’s apply this to your situation and test your endstops:
- Make sure the machine is safe to mess around in and turn off the laser power off so the laser cant fire
- Open LightBurn and click the Devices button in the Laser panel the double-click your device
- Click Next on “pick your laser”, click Next again on “how to connect”, and click Next once more
- Make sure origin is set to FRONT LEFT and that “Auto Home On Startup” is toggled OFF
- Click Next, click Finish, and finally click Okay.
- Click on the Console tab, enter M119 in the text box (under the Macro buttons) and hit Enter on the keyboard
- See how the console responds. It should look like the above example
- Now manually actuate the X endstop (press it if manual or use folded paper to interrupt if optical)
- Issue the M119 command again and look at the results. They should be X=1, Y=0, and Z=0 (like above)
- UNactuate the endstop and reissue M119. The results should be X=0, Y=0, and Z=0
- If the results show a failure then make a note of each condition and move on to the Y and Z axes the same way
If an end-stop is reading as always pressed, or never pressed, even when you press or release it, then you probably have a wiring problem, check everything.
If an endstop is read as pressed when it is not, and not pressed when it is, then your end-stop is inverted.
You can fix that situation by inverting the digital input pin in your configuration file. For example if your X min endstop pin is inverted, change :
Here is the exact mapping of pin names to inputs on the board :
|Endstop||X MIN||X MAX||Y MIN||Y MAX||Z MIN||Z MAX|
Here are more resources for endstops: