65 lines
2.8 KiB
Markdown
65 lines
2.8 KiB
Markdown
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Connecting BL-Touch
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===================
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Once you've hooked up the BL-Touch servo connector to a `control_pin` according to the BL-Touch
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documentation or of your MCU. Using the original wiring, the yellow wire from the tripple is
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the `control_pin`, the white wire from the pair is the `sensor_pin`. You need to configure
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these pins according to your wiring with Klipper:
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[bltouch]
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sensor_pin: P1.24
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# Pin connected to the BL-Touch sensor pin. This parameter must be
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# provided.
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control_pin: P1.26
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Calibrating the BL-Touch
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========================
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### Z Offset
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In order to make klipper work properly you need to tell it in which relation to the nozzle
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the probe is exactly located. Lets start with the `z_offset` - the height of the probe when
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its expanded:
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Make sure the probe is above the bed by moving the head into an appropriate x/y position:
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g0 x0 y0
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Now make klipper aproach the bed until the probe triggers using:
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PROBE
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This should deploy the BL-Touch probe, stop the run when it triggers by touching the bed.
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Now acquire the current position from the reached `z_offset` using:
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GET_POSITION
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In the output lines the `toolhead` line with the `Z:` contains the required value.
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### X/Y Offset
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In order to find the propper vertical offset of the probe you need to know a certain point of
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your bed. X/Y = 0 may be a good point for this, any other will do as long as you know it.
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Find it by lowering the nozzle next to it using `g0 z0.5`. Create a removeable mark on your
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bed by i.e. using a non permanent marker.
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Now move the tip of the BL-Touch over that point by jogging there with the conrols in the `control` tab of
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OctoPrint. Once the BL-Touch is roughly over the point acquire it using the `GET_POSITION` command.
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The difference to your marked point is your `x_offset` and `y_offset` to configure in the `printer.cfg`.
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BL-Touch gone bad
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=================
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Once the BL-Touch is in inconsistent state, it starts blinking red. You can force it to leave that
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state by issuing:
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BLTOUCH_DEBUG COMMAND=reset
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This may happen if its calibration is interrupted by the probe being blocked from being extracted.
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However, the BL-Touch may also not be able to calibrate itself anymore. This happenes if the
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screw on its top is in the wrong position, or the magnetic core inside the probe pin has moved.
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If its moved that way up that it sticks to the screw, it may not be able to lower its pin anymore.
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With this behaviour you need to open the screw, pick i.e. a ball-pen and push it gently back in place.
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Re-Insert the pin into the BL-Touch so that it falls into extracted position. Carefully readjust the
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headless screw into place. You need to find the right position so it is able to lower and raise the
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pin, and the red light turns on and of. Use the `reset`, `pin_up` and `pin_down` commands to
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achieve this.
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