From c4791963659a5bbddc7f9079ce7736b6bf0f928a Mon Sep 17 00:00:00 2001
From: CoolSpy3 <coolspythree@gmail.com>
Date: Sat, 30 Sep 2023 15:04:02 -0700
Subject: [PATCH] update i2c level shifter

* Change resistors from 4.7k to 2.4k to improve signal quality
* Connect SCL MOSFET gate to 3.3V rather than 5V
---
 i2c_level_shifter.kicad_sch     | 30 +++++++++++++++---------------
 ~crush-main-board.kicad_sch.lck |  1 +
 2 files changed, 16 insertions(+), 15 deletions(-)
 create mode 100644 ~crush-main-board.kicad_sch.lck

diff --git a/i2c_level_shifter.kicad_sch b/i2c_level_shifter.kicad_sch
index 4c6ee57..0b8c5b3 100644
--- a/i2c_level_shifter.kicad_sch
+++ b/i2c_level_shifter.kicad_sch
@@ -242,12 +242,12 @@
   (junction (at 26.67 40.64) (diameter 0) (color 0 0 0 0)
     (uuid 01be0d85-b323-46fb-99a9-fcb7e480699e)
   )
-  (junction (at 73.66 6.35) (diameter 0) (color 0 0 0 0)
-    (uuid 191d6eeb-f972-4efa-8b23-d070fa23a9cc)
-  )
   (junction (at 38.1 6.35) (diameter 0) (color 0 0 0 0)
     (uuid 2909d3e4-ae49-4a85-8aa7-773108ee3006)
   )
+  (junction (at 49.53 6.35) (diameter 0) (color 0 0 0 0)
+    (uuid 2a0bb823-4463-46b4-8cdd-31129b29976c)
+  )
   (junction (at 85.09 6.35) (diameter 0) (color 0 0 0 0)
     (uuid 2aa93019-b02d-4e77-a6bb-231b25093453)
   )
@@ -304,10 +304,6 @@
     (stroke (width 0) (type default))
     (uuid 62b6d6fc-0f98-4f17-a281-c2b7f39c56f2)
   )
-  (wire (pts (xy 73.66 6.35) (xy 62.23 6.35))
-    (stroke (width 0) (type default))
-    (uuid 6a946e28-ead1-4034-89de-177d2db71bff)
-  )
   (wire (pts (xy 73.66 26.67) (xy 100.965 26.67))
     (stroke (width 0) (type default))
     (uuid 895a265c-da7d-447b-976e-966c812dbf3b)
@@ -348,6 +344,10 @@
     (stroke (width 0) (type default))
     (uuid df94db15-2283-43ae-a762-b6dcdd5fd829)
   )
+  (wire (pts (xy 49.53 6.35) (xy 62.23 6.35))
+    (stroke (width 0) (type default))
+    (uuid e5534046-3cf1-4185-ad6c-460d7527108a)
+  )
   (wire (pts (xy 13.335 40.64) (xy 26.67 40.64))
     (stroke (width 0) (type default))
     (uuid f3418480-1888-44e2-b73a-3ead928ad631)
@@ -389,10 +389,10 @@
   (symbol (lib_id "Device:R_US") (at 38.1 15.24 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid 3ecc5b46-2ad8-4a1c-ba1d-382ca761a42a)
-    (property "Reference" "R1" (at 40.64 14.605 0)
+    (property "Reference" "R1" (at 40.64 13.97 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "4K7" (at 40.64 17.145 0)
+    (property "Value" "2k4" (at 40.64 16.51 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
     (property "Footprint" "Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder" (at 39.116 15.494 90)
@@ -442,10 +442,10 @@
   (symbol (lib_id "Device:R_US") (at 26.67 15.24 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid 7280a650-8527-4508-8586-a614dc2e24cb)
-    (property "Reference" "R2" (at 29.21 14.605 0)
+    (property "Reference" "R2" (at 29.21 13.97 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "4K7" (at 29.21 17.145 0)
+    (property "Value" "2k4" (at 29.21 16.51 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
     (property "Footprint" "Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder" (at 27.686 15.494 90)
@@ -468,10 +468,10 @@
   (symbol (lib_id "Device:R_US") (at 73.66 15.24 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid 77e5d85c-5d2e-467c-9b3e-b8c383a883e9)
-    (property "Reference" "R3" (at 76.2 14.605 0)
+    (property "Reference" "R3" (at 76.2 13.97 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "4K7" (at 76.2 17.145 0)
+    (property "Value" "2k4" (at 76.2 16.51 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
     (property "Footprint" "Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder" (at 74.676 15.494 90)
@@ -521,10 +521,10 @@
   (symbol (lib_id "Device:R_US") (at 85.09 15.24 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid b1c53bf0-2973-47ff-b95b-62f59fad474f)
-    (property "Reference" "R4" (at 87.63 14.605 0)
+    (property "Reference" "R4" (at 87.63 13.97 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "4K7" (at 87.63 17.145 0)
+    (property "Value" "2k4" (at 87.63 16.51 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
     (property "Footprint" "Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder" (at 86.106 15.494 90)
diff --git a/~crush-main-board.kicad_sch.lck b/~crush-main-board.kicad_sch.lck
new file mode 100644
index 0000000..8abe82f
--- /dev/null
+++ b/~crush-main-board.kicad_sch.lck
@@ -0,0 +1 @@
+{"hostname":"WINDELL-CUSPDJ3","username":"Ryan"}
\ No newline at end of file