dynamic zProbe trigger value

cosmowave

Hello everybody

This week i have finished more or less the work on my delta printer.
I have changed from an old Arduino/Ramps setup to a DUET2 with underbed piezo sensors. At the moment, i try to use the piezos in analog mode.
The system works fine, but i'd like to improve my bed.g, because when i change something mechanical on my bed, the absolute analog value of the piezo probe (untriggered) is changing too.
I had the idea to calculate an average value of the probe input and add a "trigger offset" (100 in this case).

My questions:

does somebody see big errors in my code? Or should it work more or less...
the variable in the "G31 P" command will not be an integer! Can the FW handle that? Or is there a possibility to convert the variable to an integer?

Thanks in advance

This is the code which i'd like to implement in bed.g, somewhere between homing and probing...

var zProbeTriggerValue = sensors.probes[x].value[x]	;first reading of analog value, setting variable

while iterations < 3	;reading 2-4
	G4 P200	; delay
	set var.zProbeTriggerValue = var.zProbeTriggerValue + sensors.probes[x].value[x]

set var.zProbeTriggerValue = var.zProbeTriggerValue / 4	; calculate average

G31 P{var.zProbeTriggerValue + 100}	; setting zProbeTriggerValue

oliof

@cosmowave change line 9 to

G31 P{floor(var.zProbeTriggerValue) +100} ; setting zProbeTriggerValue

and you should get a nice integer value.

Maybe add a safeguard against the average being 900 or higher...

cosmowave

@oliof said in dynamic zProbe trigger value:

Maybe add a safeguard against the average being 900 or higher...

That's a good idea!
Thank you!