From: Luca <luca.masera79@gmail.com>
Date: Sun, 23 Sep 2018 20:49:17 +0000 (+0200)
Subject: Circuitry sample for PS/2 Mouse (#3959)
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=58b9b22670c2c36e8502826349d8f752d8b3ab37;p=qmk_firmware.git

Circuitry sample for PS/2 Mouse (#3959)

Added a sample circuitry for handling the connection of a PS/2 Mouse.
    Even if it's written that a circuitry is needed, there're a lot of other
    things and the information gets lost really fast. A really simple sample
    helps to remember who wants to implement the functionality about the
    circuitry.
---

diff --git a/docs/feature_ps2_mouse.md b/docs/feature_ps2_mouse.md
index 909406e7d..01e2cc63d 100644
--- a/docs/feature_ps2_mouse.md
+++ b/docs/feature_ps2_mouse.md
@@ -6,6 +6,24 @@ To hook up a Trackpoint, you need to obtain a Trackpoint module (i.e. harvest fr
 
 There are three available modes for hooking up PS/2 devices: USART (best), interrupts (better) or busywait (not recommended).
 
+### The Cirtuitry between Trackpoint and Controller
+
+To get the things working, a 4.7K drag is needed between the two lines DATA and CLK and the line 5+. 
+
+```
+
+          DATA ----------+--------- PIN
+                         |
+                        4.7K
+                         |
+MODULE    5+  --------+--+--------- PWR   CONTROLLER
+                      |
+                     4.7K
+                      |    
+          CLK   ------+------------ PIN
+```
+
+
 ### Busywait Version
 
 Note: This is not recommended, you may encounter jerky movement or unsent inputs. Please use interrupt or USART version if possible.