Bltouch

npm1

@CaLviNx That is probably the most clearest article i've ever seen, I think the wiki needs more pictures and screenshots, Thank you

@FrankNPrinter Lol, I have already wired a connection like the dupont your using, so when i finally get his i would probably use that one Thanks again

npm1

Finally got the Bltouch(aliexpress knock of)
Heres a couple of pictures off it,

Which version of the bltouch do i have
if its the old one can someone provide a diagram of how to attach the 240ohm resistor

JakobH

HI,

it is as shown on the pic. you need to short(circuit) the black and the white wire. you can do this at the connector end don't start messing at the pcb-end

Jakob

npm1

can i just poke the resistor in to the dupont connector like in the diagram, or would i need to do some soldering

JakobH

I doubt anybody will publicly condone doing that, but it will work. But make sure it doesnt Fall off. Things is (and i know very little about these things) that those wires send the signal back at 5V but it's designed to receive only 3.3 - what happens to the board (or the bltouch) if it is jolted with too high a voltage i cannot tell you.
Which reminds me, first measure the resistor to verify 240Ohm, Second when attached measure again (on the conectors) if the resistance is indeed 240Ohms between the pins.

The kit i Got (supposedly original but….) had two resistors one ten ohm and one two-forty i gather using the wrong one would be bad.

coolice

Hey.

My BLTouch is just like this one in the photos and it works as is with the Duet without the resistor. However if I poke the 240ohm resistor in the black/white connector housing to test it's use, the output on the pins is much lower than the 3.3 volts, in fact is about 1.6 volts and the setup no longer works.
Without the resistor the voltage is 3.9 volts.

I've asked in the other topic as well if this 3.9 volts is a problem, but for those in this topic, is your BLTouch in the photo above working with or without the resistor?

Thanks.

Ian

p.s. Little more testing and the voltage on triggering the BLTouch jumps to 4.9 volts and then quickly drops to 3.9 volts on my DVM

npm1

hiya,
i managed to see some love from the bltouch however the servo starts to loop continuessly after testing it with the M401 cammand, i.e. produdes then retracts as soon as i touch it.

at one point the red light on the bltouch starts blinking,

This is with the reisistor when i get a chance i test it without the resistor, if it works out of the box i would be very happy

npm1

i wonder if the 3.9v @coolice would do any harm

npm1

Ok i managed to get it working howrver when i go into test mode the pin keeps portruding continuesly and doesn't stop

M280 P3 S60 I1
can someone describe which letter means what.

how many times does this command deploy the probe?
kind regards

i got mine working without the ground pin

coolice

@npm1:

i wonder if the 3.9v @coolice would do any harm

Hey buddy.

I'm not sure mate, not been given an actual answer if that would harm the Duet.
In the meantime I've series linked 3x 2k resistors and got the black and white wires now giving me 3.2x volts and have the setup running on that.

I had a problem with the posted BLTouch setup instructions not making the mesh bed levelling work for me, but I've manged to fix it I think by adding a missing line of code in the bed.g file from memory. It now homes, then when I select the mesh bed levelling works it's way from point to point over the bed proving away nicely.
I just need to check it now as the printer is so new still I've not yet printed with it Hoping to this weekend now.

I'm watching this topic as well for tips
Your BLTouch is exactly the same as mine a Classic, what voltage do you see on your black and white wires if I may ask?

Ian

npm1

Ok so i managed to get the bltouch working as per the instructions provided by CaLviNx
the wiring excludes the black wire, when the black wire is in the ground the readings don't work,

I can now click on automatic bed compensation, which performs the probing without any problem,
When the G32 command is struck it gives a graph which appears uneven. More to come on this when I get home.

the issue is when i perform G29. when i activate G29 the probe doesn't protude.

npm1

I would probably show a video

dc42

In firmware 1.18 and earlier, G29 doesn't automatically deploy the probe, so you need to wrap it in a macro. It does deploy the probe in firmware 1.19.

WalterSKW

@npm1:

Ok i managed to get it working howrver when i go into test mode the pin keeps portruding continuesly and doesn't stop

M280 P3 S60 I1
can someone describe which letter means what.

how many times does this command deploy the probe?
kind regards

i got mine working without the ground pin

These are the possible commands/combinations :
M280 P0 S10 ; pushes the pin down
M280 P0 S90 ; pulls the pin up
M280 P0 S120 ; Self test – keeps going until you do pin up/down or release alarm
M280 P0 S160 ; Release alarm

When using a probe mounted on a real servo, then the S parameter is the angle in degrees that a servo should move to.
Here it is used to pass a command to the probe.

Walter.

peirof

Hi,

I have a Bltouch, and after cut the track and lower the voltage in white pin, I have measured with a multimeter, and the tension is 3.1…. It's suficient for fire Z Probe?