From 2d6b44152a73a21186470a7840d91a6c8827556e Mon Sep 17 00:00:00 2001 From: Kevin O'Connor Date: Wed, 9 Dec 2020 13:22:40 -0500 Subject: [PATCH] bltouch: Recommend using a pullup on the sensor_pin Signed-off-by: Kevin O'Connor --- docs/BLTouch.md | 6 ++++-- docs/Config_Reference.md | 5 +++-- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/docs/BLTouch.md b/docs/BLTouch.md index 3a5c6ba6..0f97bc91 100644 --- a/docs/BLTouch.md +++ b/docs/BLTouch.md @@ -10,11 +10,13 @@ Hook up the BL-Touch "servo" connector to a `control_pin` according to 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. For example: +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: ``` [bltouch] -sensor_pin: P1.24 +sensor_pin: ^P1.24 control_pin: P1.26 ``` diff --git a/docs/Config_Reference.md b/docs/Config_Reference.md index d7dc8290..3c1f4017 100644 --- a/docs/Config_Reference.md +++ b/docs/Config_Reference.md @@ -1552,8 +1552,9 @@ section for the details). ``` [bltouch] sensor_pin: -# Pin connected to the BLTouch sensor pin. This parameter must be -# provided. +# Pin connected to the BLTouch sensor pin. Most BLTouch devices +# require a pullup on the sensor pin (prefix the pin name with "^"). +# This parameter must be provided. control_pin: # Pin connected to the BLTouch control pin. This parameter must be # provided.