Costum M Commands with GRBL

[SchagerlF]

I need more M-commands for an application than are available by default.

I already tried adding some via ChatGPT, but that only worked so-so.
My issue is that UGS throws an error like “Hold” and usually pauses whenever a certain command appears. For example, I set A1 with M11 to HIGH (an LED lights up), then set A1 with M12 to LOW, and the program pauses—I have to hit the Start button for it to continue, or else it just freezes. I should mention I’m a mechanical engineer and don’t have extensive programming skills.

Thank you for your time

[breiler]

This depends entirely on what response your controller gives to those commands. UGS expects the response to be according to the GRBL protocol spec. In this case "ok". If it responds with something else UGS will pause the program for the user to assess what to do.

[SchagerlF]

Thank you for your reply

When I write in the console M11 it sends ok back and when I send M12 it also send ok back. I really don´t know if the pause comes from UGS or from the GRBL

But when i write M12 in the console it gives ok back but goes instant in pause.

[breiler]

Post the console log with verbose logging enabled (right click in the console to activate) and run the commands manually and paste the output here.

[SchagerlF]

Thank you for your help I have deactivated the pin. Now it works without a break. I will also rewrite A0 to M13 // M14.

I have one more question and that is that the UGS now always shows Soft Reset as an alarm message. But when I do one, it does not disappear.

[breiler]

This is the exact same problem as with feed hold. The GRBL controller reports what input pins that are activated. And since you are now modifying the behaviour of A0 the controller detects this as if that pin is active and reports this to UGS.

[SchagerlF]

On the Arduino is only the code for the control of pin A1 I don´t have changede the other Pins so far.

I now have the function Reset and feed Hold on A6 and A7 but the soft reset alarm does not go away.

I should have taken a closer look at the pin assignment of the arduino beforehand, then I would have put them on A4 and A5 straight away.

[SchagerlF]

UGS_LOG_M12.txt

GRBL_Code.zip

This is the LOG
And my GRBL code

@breiler

[breiler]

It is in your code. You are output-ing to A1, which also work as a feed hold input. You would need to disable the feed-hold input.