docs: Expand BL Touch explanation of Pin config

Stating why the pullup is needed might help people who found wrong examples in the internet for probe configuration. Signed-off-by: Patrick Gerken <[email protected]>
Klipper3d · Oct 29, 2024 · 690ac7b · 690ac7b
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commit 690ac7b
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/docs/BLTouch.md b/docs/BLTouch.md
@@ -12,8 +12,8 @@ the BL-Touch documentation or your MCU documentation. Using the
 original wiring, the yellow wire from the triple is the `control_pin`
 and the white wire from the pair is the `sensor_pin`. You need to
 configure these pins according to your wiring. Most BL-Touch devices
-require a pullup on the sensor pin (prefix the pin name with "^"). For
-example:
+are configured to use an open drain output. They require a pullup resistor
+on the sensor pin (prefix the pin name with "^") to work reliably. For example:
 
 ```
 [bltouch]