Z Axis Min Stop with Capacitive Sensor

I am using Autonics CR18-8DN DC10~30 8mm M18 Capacitive Proximity Sensor NPN-NO (Shielded)

for the Z Axis Endstop while X and Y are Sensorless using the TMC2209 on the BTT SKR 1.4 Turbo Board.

I am not able to setup the said Capacitive Proximity Sensor.


I have used a LM7805 to convert the 12 V Input from the sensor to 5V Output which is plugged in the SKR 1.4 Turbo board in the Z-Endstop port


M119 sometimes shows OPEN with a test object but if I trigger it then it keeps showing Triggered and fails to go back to Open when the sensor is cleared of the test object.


Note: Using the Marlin 2.0.x Bugfix version

Edited 1 time(s). Last edit at 01/19/2021 01:16PM by saintofinternet.

when you have TMC2209 and are not using "sensorless" on the axis concerned, with a SKR 1.4 you MUST remove the diag pin of the stepper driver or it electrically interferes with the endstop.



Edited 1 time(s). Last edit at 01/19/2021 04:09PM by Dust.

yes!

that specific Pin has been removed for the Z Axis driver.

reply unclear.

yes as In I already did this and it didn't help

or

yes I did this and it is now working?

so sorry for that half reply from my side... my apologies.


yes... i did cut that Diag Pin but still it does not help.

Does you config files have the line #define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN ?

if not marlin looks at the probe pin, not the Z endstop pin

yes... it's defined as

/**
* Enable this option for a probe connected to the Z-MIN pin.
* The probe replaces the Z-MIN endstop and is used for Z homing.
* (Automatically enables USE_PROBE_FOR_Z_HOMING.)
*/
#define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN

// Force the use of the probe for Z-axis homing
//#define USE_PROBE_FOR_Z_HOMING