Bltouch z probe as z min endstop

fobetor

hi
I amtrying to use the bltouch sensor as both z probe and endstop. I can make it work as z probe, since I can write in the firmware the start script to make the sensor pin down/up. BUT.. I am wondering how to make the sensor pin go down when I tell the printer to home the Z axis. Since the start z probe script is to tell it to be up and lower the pin when starting probing, how do I tell to put pin down when homing, so the extuder nozzle does not hit the heat bed?
Thanks

Repetier

Make sure z min pin and z probe pin are identical. That should make firmware run the start script as well for z probing. Also make sure to use homing order with preheat so you can define a position to probe so activating z probe works. Set preheat temperature to 0.

fobetor

Thanks,
I will try your instructions.
regards

fobetor

Hello
Where do I set the preheat temp to 0?
On the other hand... It does not work.
I have plugged the sensor to the Zmin, and assigned the z probe pin to the z min pin. Then, when I tell the printer to home Z, It homes X, Y, and beging moving z in a strange way:
-It lowers Z a little
- It rises Z by some cm
-Then it begins lowering Z
And it stops where the Z axis was when I turned on the printer, (where repetier thinks the Z=0 is). It does not lower the Z until it finds an endstop,without using the Sensor.
I am missing someting?
thanks

Repetier

In config tool when you select the homing order the fields appear.

I did mean to use z min pin directly, what I meant is you need to say you have a z min endstop and use the same pin for this as for z probe, so firmware knows they are identical.