BLTouch doesn't always deploy Duet 3 6HC

ComedianTF2 · 2 Jul 2021, 14:46

I've had a similar issue, and managed it to narrow it down to the yellow BLTouch cable not being connected properly. I did a quick check disconnecting the cables one by one, and homing, and these are the results:

white cable: no self-test, red LED on like normal, Z-probe value 1000, ejects pin but instantly retracts it and errors out
black cable: no self-test, red led like normal, z-probe value 0 until homing, then goes to 1000 and errors out
Yellow cable: completes self test, red LED works like it should, the Z-probe value is 0, but does not detect the homing, and will continue to move down even after pin gets disturbed
red cable: does not do self test, no red LED, Z-probe value 1000
brown cable: completes self test, red LED works, Z-probe value 0, ejects pin, works like normal

Note that my bltouch does not always do the self-test on bootup, and I'm not sure why so that part of the test might not be accurate

This is with a Duet 2 on RRF2 by the way

Nuramori · 2 Jul 2021, 16:15

@Veti there was an issue in a previous firmware version that P500 was a problem, and reducing it to P100 would help, per David’s suggestion. It did. After that version I went back to P500 as a mid value and the problem re-emerged. Going to P100 fixed it, so I’ve kept the value.

ctilley79 · 7 Feb 2021, 16:40

@Nuramori Is your issue that the probe deploys and doesn't trigger, or are you having an issue with the probe not deploying at all?

Nuramori · 7 Feb 2021, 20:46

@ctilley79 It was that it would deploy but not trigger.

ctilley79 · 7 Feb 2021, 21:54

@Nuramori ok. That’s different than my issue. If I can get mine to deploy, it works flawlessly. Mine is not reacting to m401 or m402 commands after a given period of time.

User3D · 2 Oct 2021, 05:25

@ctilley79 I wanna know if you have deployprobe.g and retractprobe.g in /sys only !!!!! (If you do , can you post them here)

ctilley79 · 9 Feb 2021, 16:15

@User3D Yes. They are automatically generated if you select P9 as the probe type if i'm not mistaken. Here's a copy of mine

M280 P0 S10 ; deploy BLTouch

M280 P0 S90 ; retract BLTouch

User3D · 10 Feb 2021, 05:31

@ctilley79 said in BLTouch doesn't always deploy Duet 3 6HC:

@User3D Yes. They are automatically generated if you select P9 as the probe type if i'm not mistaken. Here's a copy of mine

Yes they are, I just wanted to see if you've changed something that is causing all .

ctilley79 · 14 Mar 2021, 17:31

Any update on this? just broke a bltouch probe because of this issue.

SJI · 16 Mar 2021, 03:18

I was having issues on IO_6, no deploy. checked wiring etc, all ok from that end. Changed to IO_7, now it works.

Phaedrux · 16 Mar 2021, 03:50

@ctilley79 said in BLTouch doesn't always deploy Duet 3 6HC:

Any update on this? just broke a bltouch probe because of this issue.

I've poked DC42 to take a look again when he has a moment.

Were you able to try a different BLTouch?

bzad · 19 Aug 2021, 01:49

Hi was this issue solved? I’m having this issue ive brand new bltouch connected to io7

Phaedrux · 19 Aug 2021, 03:42

@bzad said in BLTouch doesn't always deploy Duet 3 6HC:

Hi was this issue solved? I’m having this issue ive brand new bltouch connected to io7

Probably best to start a new thread with your issue.