Unable to make it working on MKS Robin nano 1.2

[Carontes]

On my printer I have a 3D Touch V3.2 Pro by Geeetech and it works. Now I wanted to switch to the BD Sensor, so I just switched the 3D touch with the bd sensor, since they have the same wire connections, but it doesn't work. Then I thought it could have been something in my wire connection so I used the wires that come with the sensor and connected them directly to the motherboard but still no success. I used this code in Marlin #define I2C_BD_SDA_PIN PA11 #define I2C_BD_SCL_PIN PA8 according to this page. Is there something I'm doing wrong or missing? Thank you

[markniu]

Since there is a large signal filter capacitor on the endstop pin on all the MKS board. we can't use that pin directly, here you can try to use the PB2 instead of PA8.

[Carontes]

I tried it but when it's time to home the Z axis the printer fails and on the screen there's this message BDsensor connect Err!: PRINTER HALTED Please Reset It's the same message as the one it appeared with the "old" setting when I used the PA8. In Marlin I use the pins_MKS_ROBIN_NANO_common.h file to edit the pins for the sensor, is it right?

[markniu]

oh, sorry, not PA8 but PA11. it should be like this:

define I2C_BD_SDA_PIN PB2

define I2C_BD_SCL_PIN PA8

[Carontes]

Thank you now it works. But now there's another problem, the bed leveling doesn't work. It starts the first row out of 8 and then it stops

[markniu]

could you share your confiure files or send to me?

[Carontes]

Where can I send it?

[markniu]

niujl123@sina.com, you can upload to google drive and send me the link.

[Carontes]

Did you receive it?

[Carontes]

I tried disabling BD_SENSOR_PROBE_NO_STOP and it works, but of course I loose the fast way of leveling the bed (but it's always faster than doing it with a bl touch). So there must be something weird in that line, I don't know if it can helps but I also use a dual Z stepper system so I can use the auto-alignment feature in Marlin. My STRING_DISTRIBUTION_DATE "2023-11-18" to be sure, in case this bugfix version doesn't have it enabled in it

[markniu]

Here is one temp solution. https://github.com/MarlinFirmware/Marlin/issues/26738#issuecomment-1916999940 replace the if (inInc > 0 ? (pos >= cmp) : (pos <= cmp)) break; with if (inInc > 0 ? ((pos+1) >= cmp) : (pos <= (cmp+1))) break;

in the file Marlin/src/gcode/bedlevel/abl/G29.cpp

I tried disabling BD_SENSOR_PROBE_NO_STOP and it works, but of course I loose the fast way of leveling the bed (but it's always faster than doing it with a bl touch).

[Carontes]

Hi, sorry for the long delay but I had troubles with my printer and never had the chance to use it. Anyway I tried your solution and it works, hoping to see the new fix in the next Marlin versions without changing the code manually. Thank you again