Creality CR Touch Sensor

[Wladekcz]

BL-Touch is a kind of semiconductor hall sensor. Creality's CR-Touch is a sensor based on optical technology.

[T3P3Tony]

@wladekcz said in Creality CR Touch Sensor:

CR-Touch

ahh so they changed to this:
https://www.creality3dofficial.com/products/creality-cr-touch ?

Have you got the pinout, data sheet, voltage levels etc?

[Wladekcz]

Yes, I have this datasheet, it still doesn't change anything.

[rjenkinsgb]

OK, confusion! The mention of BL Touch in the original question made it appear to the the Antclabs one.

They appear to both use exactly the same connections & same newer colour cable as my BL version - but do have some differences in the control signal, unfortunately, as the articles mention different software/firmware addons.

https://www.creality3dofficial.com/products/creality-bl-touch

https://www.creality3dofficial.com/products/creality-cr-touch

Edit - looking through the installation docs for the new CR touch, it still uses the BL Touch firmware - so presumably it does use the same signals?? Possibly just a custom BL Touch version for them?

[Wladekcz]

I am sending photos and files: configuration, M122.

config_g.txt
config-override _g.txt
M122.txt

[rjenkinsgb]

Where you show the plug and socket linking the two cables, the wire sequence from the probe is reversed.

I believe it should be, without rearranging the plug at the Duet board end:

Probe white and red to duet red.
Probe black to duet black
Probe yellow to duet blue
Probe blue to duet green

[Wladekcz]

@rjenkinsgb

Yes you are right, this is another attempt, in the previous version "IN" and "OUT" were swapped and the effect was the same. I am thinking about the resistor but I do not know where to connect it.

[rjenkinsgb]

The power (+5v) and ground are still reversed!

Change it to match the connections I put in my last post.

[Wladekcz]

@rjenkinsgb Unfortunately, the reversal of 5+ and the ground did not give the expected effect. The core was not ejected. M401 and M402 do not work. Robert please check config_g.
It is like this
"; Probe Z
M950 S0 C "io7.out"
M558 P9 C "! Io7.in" H5 F120 T6000
G31 P500 X30 Y30 Z2.5
M557 X30: 280 Y30: 280 S30
Shouldn't it be like this:
M950 S0 C "io7.out"
M558 P9 C "^! Io7.in" H5 F120 T6000
G31 P500 X30 Y30 Z2.5
M557 X30: 280 Y30: 280 S30

[T3P3Tony]

@wladekcz said in Creality CR Touch Sensor:

M558 P9 C "^! Io7.in" H5 F120 T6000

no you should not have the pullup (^) on the input pin. Also if its the same as a normal BL touch from a signal perspective then the signal inversion (!) is also not needed so try:

M950 S0 C "io7.out"
M558 P9 C "Io7.in" H5 F120 T6000

[Wladekcz]

@t3p3tony I connected the sensor cable directly to the connector on the Duet3. After connecting the power, the sensor turned blue.

Still not working properly. I measured the tensions between the cables. Between the ground and 5+ "4.9V". Between ground and white and yellow "4.88V". I read on the wiki that out and in only tolerate 3.3V. Do you have any suggestions.

[rjenkinsgb]

This is my BLTouch config:

; Z-Probe
M950 S0 C"io7.out"                           ; create servo pin 0 for BLTouch
M558 P9 C"^io7.in" H5 F100 T6000             ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X-46 Y4.5 Z2.840                    ; set Z probe trig value, offset (from TC face centre)+ trigger height
M557 X0:240 Y10:270 S20                      ; define mesh grid

You need to adjust the offsets and grid to suit your machine.

It is unfortunately possible that it may have been damaged by having the positive and negative power reversed.

[rjenkinsgb]

From that photo, you still have some wires wrong.

With the Duet connector as shown above:

The first pin on the left should be just black (+5V)
Second pin: Yellow; OK (Out from Duet, In to probe)..
Third pin: Red and White; (Grounds).
Fourth pin: Blue (Out of probe, In on duet).
Fifth pin: No connection; OK.

[Wladekcz]

@rjenkinsgb This was the case in the previous version and you suggested that I change what I did. Take a look at the previous photos. So I have to return to the original version. Red - 5+, yellow - in, black with blue - ground, white - out, empty - 3.3V

[Wladekcz]

@rjenkinsgb said in Creality CR Touch Sensor:
I connected according to your last instruction. The sensor glows blue, the core is hidden. Will not respond to M401 / M402. Without the "!" With Probe 1000. In your configuration "M558 P9 C" ^ io7.in "H5 F100 T6000" appears "^" And I don't know if it should be or not

M122.txt

config,g.txt

[Wladekcz]

I measured the voltage on the sensor:
red - yellow 0.115Volt
red - blue 1.583V
red - black 4.905V
black - yellow 0.115V
black - blue 1.583V

[rjenkinsgb]

OK; that wiring is now exactly the same as my fully working probe + 6HC setup.
I have just done a continuity check from the probe to the board to 100% confirm that is how it is connected.

The Crealty diagram shows the CL version uses exactly the same electrical wiring as the BL one.

So, either the Crealty documentation is wrong re. the probe control values etc. and it needs different parameters in the config file compared to a BL-Touch, or the probe has been damaged by reverse supply connections earlier on..

[wayneosdias]

@Wladekcz said in Creality CR Touch Sensor:

G31 P500 X30 Y30 Z2.5

I know this old but I just went thru same issue; Min 5+ and CR Touch
Probe would deploy/retract and trigger, but not reset post probing. In DWC the reported value was 1000.
I changed Duet configurator supplied G31;

G31 P500 X30 Y30 Z2.5

to

G31 P1000 X30 Y30 Z2.5

It all seems to work fine now. Given I never had a miss wire so there still be a HW issue w that.