Servo deployed probe on Duet Maestro
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@Phaedrux I'm working the pinouts out although I don't see that as the problem as such. I guess what I'm asking is for confirmation of the gcode I should be using to make this work. I'm working hard to get my head around it all. Keen to learn.
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Well the config portion would be very similar to the bltouch. You'd need to define the servo pin with an M950 and you can use the deployprobe/retractprobe macros to control it with servo movement commands. It'll depend on your servo what those commands are. And your M558 trigger pin would need to be defined.
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Thanks for the info. I connected the servo up to the board and was trying to use the command line to send gcode to try test it but I've figured I have to connect everything up and then work through the gcode to get it to do what I want. I was trying to test but I think I've oversimplified thinks in my own mind.
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Here's an alternate probe kind of like the BLtouch that might open your mind to thinking about how it might work for yours.
https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_Touch_Mi
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Thanks. I hope to get to a position over the weekend to be able to test everything. This will be useful.
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Post some photos/diagram of your intended wiring and you might get some feedback.
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@Phaedrux I'll add some in the morning before I look to test/proceed. Thanks for the advice.
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i am using this
https://www.thingiverse.com/thing:3303618
and it works on the maestro.
all the connections are going to the z probe header.
gnd is combined and 5v is combined in this case.
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Thanks all. @Veti how did you define that probe in your config?
I plan to try get this working tomorrow
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M574 Z1 S2 ; Set endstops controlled by probe
M950 S0 C"^zprobe.mod" ; create servo pin 0 for BLTouch
M558 P8 C"^zprobe.in" H2 F900 T6000 ; Set Z probe type to switch and the dive height + speeds
G31 P1000 X31 Y-8 Z2.43 ; Set Z probe trigger value, offset and trigger height -
Thanks. I’ll need to work through each command but it’s very helpful having a reference. Appreciate your help
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I've tried to get this to work today. I think the servo may have broken though. I initially was able to get the servo to deploy the probe but the M402 retract command did it not M401 so I figured my deploy and retract settings were obviously wrong. Neither command does anything now.
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Smaller servos can burn out if forced in a way they can't go.
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@Phaedrux That's likely what has happened. I plan to take it out later. I've ordered a new one in case it has. I'll test it out of the printer.
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I've replaced the servo and the probe now deploys. It seems to work fine when I issue M401 and it retracts to M402.
In the dashboard my probe is showing as 1000. I'm a bit lost with this part. I've defined it as a switch with P8.
The nipple microswitch (for want of a better description) I'm currently using has two wires, so different to a microswitch I'm used to where there are 3 connection points. It's a Zippy switch. I'm trying to work out the two wires which at the moment I have one connected to the 3.3v on the zprobe header and the other to the zprobe.in.
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And what do you have in your M558 line? It may need to be inverted.
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@Phaedrux This is what I currently have.
M950 S0 C"^zprobe.mod" ; create servo pin 0 for BLTouch M558 P8 C"^zprobe.in" H5 F120 T6000 ; Set Z probe type to switch and the dive height + speeds G31 P1000 X-20 Y-10 Z15 ; Set Z probe trigger value, offset and trigger height -
Try this
M558 P8 C"^!zprobe.in" H5 F120 T6000
G31 P500 X-20 Y-10 Z15 -
@Phaedrux Thanks, it's now showing as 0!
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So I'm following the test guidance. To manually test. I've just ran G30 and the probe deploys and Z starts to move up but then an error is triggered.
G30
Error: Z probe was not triggered during probing moveIt may be one for the morning.... a clear head and do some more reading.
