H1 command for an endstop switch (microswitch)

jay_s_uk

@axiom so you mean probes and not endstops. That's different, you can have more than one. Just make sure you use the correct K value when using G30 and you'll be fine

dc42

@axiom it sounds to me that your "endstops" are actually configured as Z probes. You can indeed have more than one Z probe.

The usual way of homing using a Z probe is to use the G30 command, and you can provide a K parameter with this command to tell it which Z probe to use.

If the microswitch triggers when the nozzle if 15mm higher than the bed then you should set the G31 Z parameter for that probe to 15. For historical reasons the Z parameter isn't the offset, it's the trigger height (the negative of the offset). Again, use the K parameter of the G31 command to specify which probe that command refers to.

axiom

@dc42 I have now made the following entry in cofig.g:
; Z-Probe two of them
M558 K0 P1 C"!zprobe.in" H5 F120 T6000 ; set Z probe type to unmodulated and the dive height + speeds
M558 K1 P8 A2 S0.2 C"zstop" H5 F80 T3000
G31 P1000 K0 X-1 Y-61 Z2.3 ; set Z probe trigger value, offset and trigger height
G31 P1000 K1 X0 Y0 Z15 ; Second Z offset
M557 X0:740 Y-27:602 S35 ; define mesh grid

When I first go to z=50 (G1 z50= and enter G30 K1 via the console, I get the message: "Error: Probe already triggered at start of probing move"

dc42

@axiom are you using the normally-open or normally-closed microswitch contacts?

Your DWC screen shot indicates that Z probe K1 is registered as triggered (the value is 1000). Was that correct?

axiom

@dc42 I don't quite understand that...how do I recognize that?...if I bring the contacts of the microswitch (puck) together (bring them into contact...i.e. nozzle and puck) the display for the probe goes to zero.. .that's actually correct, isn't it?

Phaedrux

P1000 means triggered
P0 means not triggered

axiom

@Phaedrux got it... just had to say "!" put in front of the name of the connection. G30 K1 works. But I would like to read the value and set this value minus the 15mm (height of the puck) as Z=0.

Phaedrux

@axiom said in H1 command for an endstop switch (microswitch):

But I would like to read the value and set this value minus the 15mm (height of the puck) as Z=0.

I don't understand what you mean exactly.

axiom

@Phaedrux I would like to use it to automatically measure the z-offset...so I no longer have to put paper underneath it

axiom

@Phaedrux so I need to be able to set the trigger value as z=0.

Phaedrux

What is the puck you mention? Can you show a photo of your setup?

axiom

@Phaedrux
The part with the blue cap is the capacitive sensor, the part on the glass plate on the heatbed is the "puck/microswitch". Contact with the printhead triggers it...that works