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When starting the printer, the bed leveling sensor does its little startup thing and then lights up static red. When pressing Level Bed or Auto Home it homes X and Y and after that sends the Z-axis crashing into the bed.

Is there anything I can change in the firmware to debug or fix this? I have checked the wiring and it's correct.

EDIT: The BLTouch is not a genuine Creality since at the time it for some reason was not available in my country. The bl touch is connected like any other BLTouch. 2 wires to the Z switch connector, and 3 of them to "+5v", "gnd" and "in". The firmware i got of Marlins github and modified the Ender 3 Pro firmware i got of Marlins configuration GitHub. (Marlin BugFix 2.0) The stuff i modified i put here:

Configuration.h

#define USE_PROBE_FOR_Z_HOMING
#define BLTOUCH
#define NOZZLE_TO_PROBE_OFFSET { -42, -5, 0 }
#define AUTO_BED_LEVELING_BILINEAR
#define PREHEAT_BEFORE_LEVELING
#define LEVELING_BED_TEMP 65
#define GRID_MAX_POINTS_X 5
#define LCD_BED_LEVELING
#define Z_SAFE_HOMING

Configuration_adv.h

#define BABYSTEP_ZPROBE_OFFSET

I compiled this firmware with PlatformIO in VScode with env:STM32F103RET6_creality The board i used is version 4.2.2 32-bit.

The video i used can be seen here:

Ee0Rk
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  • Welcome to 3DPrinting.SE! Please note that we'd love to help out, but there isn't much information to work with. How did you connect the touch sensor (is it a genuine BLTouch or a 3DTouch or Creality Touch?), which firmware did you upload (pre-compiled or made yourself)? Possibly post a link to a video. – 0scar Jan 11 '22 at 11:52
  • Have you flashed a bootloader first? The original Ender3 came without a bootloader. See point 2: https://3dprinting.stackexchange.com/questions/12153/updating-marlin-firmware-step-by-step-guide – Trish Jan 11 '22 at 13:57
  • @Trish No, if you have a 32 bit board you just need to put the new firmware on an sd card and it installs it. I have verified that it got the firmware so thats not a problem. – Ee0Rk Jan 11 '22 at 15:06
  • That didn't work for the original, which had no bootloader and a 16 bit board – Trish Jan 11 '22 at 15:58
  • The later Ender 3 Pros Shipped with V4 boards wich are 32 bit and comes with a bootloader that can firmware update from an sd card – Ee0Rk Jan 11 '22 at 17:06

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