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docs: Add touch_mode sensor test to BLTouch.md 

Describe how to test the sensor pin using the BLTouch touch_mode.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2020-04-02 09:38:40 -04:00
parent 7a67cb86d5
commit 291fbe0801
1 changed files with 23 additions and 13 deletions
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36
docs/BLTouch.md
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@ -56,13 +56,24 @@ wiring and configuration again. Next issue a `BLTOUCH_DEBUG
COMMAND=pin_up`, verify that the pin moves up, and that the red light COMMAND=pin_up`, verify that the pin moves up, and that the red light
turns on again. If it's flashing then there's some problem. turns on again. If it's flashing then there's some problem.
Now, it's time to test homing with a twist. Instead of letting the The next step is to confirm that the sensor pin is working correctly.
probe pin touch the print bed, let it touch the nail on your Run `BLTOUCH_DEBUG COMMAND=pin_down`, verify that the pin moves down,
finger. So issue a `G28`, wait until it starts to move down, and stop run `BLTOUCH_DEBUG COMMAND=touch_mode`, run `QUERY_PROBE`, and verify
the movement by very gently touching the pin with your nail. You that command reports "probe: open". Then while gently pushing the pin
probably have to do it twice, since the default configuration makes it up slightly with the nail of your finger run `QUERY_PROBE` again.
probe twice. But be prepared to turn off the printer, to avoid damage, Verify the command reports "probe: TRIGGERED". If either query does
if it doesn't stop when you touch the pin. not report the correct message then check your wiring and
configuration again. At the completion of this test run `BLTOUCH_DEBUG
COMMAND=pin_up` and verify that the pin moves up.
After completing the BL-Touch command and sensor tests, it is now time
to test homing, but with a twist. Instead of letting the probe pin
touch the print bed, let it touch the nail on your finger. Position
the head far from the bed, issue a `G28`, wait until it starts to move
down, and stop the movement by very gently touching the pin with your
nail. You probably have to do it twice, since the default
configuration makes it probe twice. But be prepared to turn off the
printer, to avoid damage, if it doesn't stop when you touch the pin.
If that was successful, do another `G28` but this time let it touch If that was successful, do another `G28` but this time let it touch
the bed as it should. the bed as it should.
@ -99,11 +110,11 @@ or the magnetic core inside the probe pin has moved. If it has moved
up so that it sticks to the screw, it may not be able to lower its pin up so that it sticks to the screw, it may not be able to lower its pin
anymore. With this behavior you need to open the screw and use a anymore. With this behavior you need to open the screw and use a
ball-point pen to push it gently back into place. Re-Insert the pin ball-point pen to push it gently back into place. Re-Insert the pin
into the BL-Touch so that it falls into the extracted into the BL-Touch so that it falls into the extracted position.
position. Carefully readjust the headless screw into place. You need Carefully readjust the headless screw into place. You need to find the
to find the right position so it is able to lower and raise the pin right position so it is able to lower and raise the pin and the red
and the red light turns on and of. Use the `reset`, `pin_up` and light turns on and of. Use the `reset`, `pin_up` and `pin_down`
`pin_down` commands to achieve this. commands to achieve this.
BL-Touch output mode BL-Touch output mode
==================== ====================
@ -144,7 +155,6 @@ BL-Touch output mode
issued by any slicer, macro or anything else, it is preferably only to be issued by any slicer, macro or anything else, it is preferably only to be
used when first integrating the probe into a printers electronics. used when first integrating the probe into a printers electronics.
Troubleshooting Troubleshooting
=============== ===============