From 34351baa98ffbdaa85b77c444f740e0abad511ef Mon Sep 17 00:00:00 2001
From: Denis Chevalier <perso@denischevalier.fr>
Date: Sat, 8 Aug 2026 15:07:16 +0200
Subject: Improve global project (typos, enforce 80 columns whenever possible,
 diagrams) and finish 3.1

---
 pictures/grid.svg | 1177 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1177 insertions(+)
 create mode 100644 pictures/grid.svg

(limited to 'pictures/grid.svg')

diff --git a/pictures/grid.svg b/pictures/grid.svg
new file mode 100644
index 0000000..542538c
--- /dev/null
+++ b/pictures/grid.svg
@@ -0,0 +1,1177 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   viewBox="0 0 754.0932 593.61035"
+   width="754.0932"
+   height="593.61035"
+   style="font-family:serif"
+   version="1.1"
+   id="svg84"
+   sodipodi:docname="grid.svg"
+   inkscape:version="1.4.4 (dcaf3e7d9e, 2026-05-05)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:cc="http://creativecommons.org/ns#">
+  <sodipodi:namedview
+     id="namedview84"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="false"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     showborder="false"
+     borderlayer="false"
+     inkscape:zoom="1.2698413"
+     inkscape:cx="353.98125"
+     inkscape:cy="290.5875"
+     inkscape:window-width="1920"
+     inkscape:window-height="1011"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg84" />
+  <defs
+     id="defs7">
+    <marker
+       style="overflow:visible"
+       id="Triangle"
+       refX="0"
+       refY="0"
+       orient="auto-start-reverse"
+       inkscape:stockid="Triangle arrow"
+       markerWidth="1"
+       markerHeight="1"
+       viewBox="0 0 1 1"
+       inkscape:isstock="true"
+       inkscape:collect="always"
+       preserveAspectRatio="xMidYMid">
+      <path
+         transform="scale(0.5)"
+         style="fill:context-stroke;fill-rule:evenodd;stroke:context-stroke;stroke-width:1pt"
+         d="M 5.77,0 -2.88,5 V -5 Z"
+         id="path135" />
+    </marker>
+    <!-- Standard CAD Arrowheads -->
+    <!-- Standard Banana Jack Hole Pattern (8.0 mm) -->
+    <g
+       id="jack-hole">
+      <circle
+         cx="0"
+         cy="0"
+         r="11.2"
+         fill="#ffffff"
+         stroke="#000000"
+         stroke-width="1.2"
+         id="circle2" />
+      <line
+         x1="-14"
+         y1="0"
+         x2="14"
+         y2="0"
+         stroke="#000000"
+         stroke-width="0.5"
+         stroke-dasharray="2, 2"
+         id="line2" />
+      <line
+         x1="0"
+         y1="-14"
+         x2="0"
+         y2="14"
+         stroke="#000000"
+         stroke-width="0.5"
+         stroke-dasharray="2, 2"
+         id="line3" />
+    </g>
+    <!-- Potentiometer Shaft Hole Pattern (7.0 mm) -->
+    <g
+       id="pot-hole">
+      <circle
+         cx="0"
+         cy="0"
+         r="9.8000002"
+         fill="#ffffff"
+         stroke="#000000"
+         stroke-width="1.2"
+         id="circle3" />
+      <line
+         x1="-12"
+         y1="0"
+         x2="12"
+         y2="0"
+         stroke="#000000"
+         stroke-width="0.5"
+         stroke-dasharray="2, 2"
+         id="line4" />
+      <line
+         x1="0"
+         y1="-12"
+         x2="0"
+         y2="12"
+         stroke="#000000"
+         stroke-width="0.5"
+         stroke-dasharray="2, 2"
+         id="line5" />
+    </g>
+    <!-- LED Indicator Hole Pattern (3.2 mm) -->
+    <g
+       id="led-hole">
+      <circle
+         cx="0"
+         cy="0"
+         r="4.48"
+         fill="#000000"
+         stroke="#000000"
+         stroke-width="1"
+         id="circle5" />
+      <line
+         x1="-7"
+         y1="0"
+         x2="7"
+         y2="0"
+         stroke="#000000"
+         stroke-width="0.5"
+         stroke-dasharray="2, 2"
+         id="line6" />
+      <line
+         x1="0"
+         y1="-7"
+         x2="0"
+         y2="7"
+         stroke="#000000"
+         stroke-width="0.5"
+         stroke-dasharray="2, 2"
+         id="line7" />
+    </g>
+  </defs>
+  <!-- ================================================================= -->
+  <!-- TITLE & HEADER                                                    -->
+  <!-- ================================================================= -->
+  <!-- ================================================================= -->
+  <!-- VIEW 1: FULL FRONT PANEL GRID ELEVATION (LEFT VIEW)                -->
+  <!-- ================================================================= -->
+  <text
+     x="93.644455"
+     y="9.6103516"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="13px"
+     font-weight="700"
+     id="text9">FULL PANEL GRID LAYOUT</text>
+  <text
+     x="93.644455"
+     y="25.610352"
+     text-anchor="middle"
+     fill="#666666"
+     font-size="10px"
+     id="text10"
+     style="fill:#000000;fill-opacity:1">(Scale: 2.8 px/mm | 2 Columns × 8 Rows)</text>
+  <rect
+     x="40.444454"
+     y="85.610352"
+     width="106.4"
+     height="497.84"
+     fill="#f8fafc"
+     stroke="#000000"
+     stroke-width="2"
+     id="rect10"
+     style="fill:#ffffff;fill-opacity:1" />
+  <line
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+  <use
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+  <text
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+     y="151.34035"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
+     id="text15">A1</text>
+  <text
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+     y="151.34035"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
+     id="text16">B1</text>
+  <line
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+  <use
+     href="#jack-hole"
+     x="173.47"
+     y="225.57001"
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+     transform="translate(-106.35555,-24.389648)" />
+  <use
+     href="#jack-hole"
+     x="226.81"
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+     transform="translate(-106.35555,-24.389648)" />
+  <text
+     x="67.114456"
+     y="204.68036"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
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+  <text
+     x="120.45445"
+     y="204.68036"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
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+  <line
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+  <text
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+     y="258.02036"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
+     id="text19">A3</text>
+  <text
+     x="120.45445"
+     y="258.02036"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
+     id="text20">B3</text>
+  <line
+     x1="28.644451"
+     y1="307.86035"
+     x2="158.64445"
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+     stroke-dasharray="8, 3, 2, 3"
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+     href="#pot-hole"
+     x="173.47"
+     y="332.25"
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+     transform="translate(-106.35555,-24.389648)" />
+  <use
+     href="#pot-hole"
+     x="226.81"
+     y="332.25"
+     id="use21"
+     transform="translate(-106.35555,-24.389648)" />
+  <text
+     x="67.114456"
+     y="311.36035"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
+     id="text21">A4</text>
+  <text
+     x="120.45445"
+     y="311.36035"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
+     id="text22">B4</text>
+  <use
+     href="#led-hole"
+     x="200.14"
+     y="358.92001"
+     id="use22"
+     transform="translate(-106.35555,-24.389648)" />
+  <line
+     x1="28.644451"
+     y1="361.20035"
+     x2="158.64445"
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+     stroke-dasharray="8, 3, 2, 3"
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+  <use
+     href="#jack-hole"
+     x="173.47"
+     y="385.59"
+     id="use23"
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+     href="#jack-hole"
+     x="226.81"
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+     x="67.114456"
+     y="364.70035"
+     text-anchor="middle"
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+     font-size="8px"
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+     id="text24">A5</text>
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+     y1="414.54034"
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+  <use
+     href="#jack-hole"
+     x="173.47"
+     y="438.92999"
+     id="use25"
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+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
+     id="text26">A6</text>
+  <text
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+     y="418.04034"
+     text-anchor="middle"
+     fill="#000000"
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+     font-weight="700"
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+  <line
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+     y1="467.88034"
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+     x="173.47"
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+     x="226.81"
+     y="492.26999"
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+  <text
+     x="67.114456"
+     y="471.38034"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
+     id="text28">A7</text>
+  <text
+     x="120.45445"
+     y="471.38034"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
+     id="text29">B7</text>
+  <line
+     x1="28.644451"
+     y1="521.22034"
+     x2="158.64445"
+     y2="521.22034"
+     stroke="#000000"
+     stroke-width="0.8"
+     stroke-dasharray="8, 3, 2, 3"
+     id="line29" />
+  <use
+     href="#jack-hole"
+     x="173.47"
+     y="545.60999"
+     id="use29"
+     transform="translate(-106.35555,-24.389648)" />
+  <use
+     href="#jack-hole"
+     x="226.81"
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+     id="use30"
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+     y="524.72034"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
+     id="text30">A8</text>
+  <text
+     x="120.45445"
+     y="524.72034"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="8px"
+     font-weight="700"
+     id="text31">B8</text>
+  <line
+     x1="40.444454"
+     y1="85.610352"
+     x2="40.444454"
+     y2="50.610352"
+     stroke="#000000"
+     stroke-width="0.75"
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+     x2="146.84445"
+     y2="50.610352"
+     stroke="#000000"
+     stroke-width="0.75"
+     id="line32" />
+  <line
+     x1="44.815609"
+     y1="49.610352"
+     x2="142.47328"
+     y2="49.610352"
+     stroke="#000000"
+     stroke-width="1.14964"
+     marker-start="url(#arrow-start)"
+     marker-end="url(#arrow-end)"
+     id="line33"
+     style="marker-start:url(#Triangle);marker-end:url(#Triangle)" />
+  <text
+     x="93.644455"
+     y="44.610352"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="10.5px"
+     font-weight="700"
+     id="text33">38.0 mm</text>
+  <text
+     x="67.114456"
+     y="70.610352"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="9px"
+     font-weight="700"
+     id="text34">Col 1 (A)</text>
+  <text
+     x="120.45445"
+     y="70.610352"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="9px"
+     font-weight="700"
+     id="text35">Col 2 (B)</text>
+  <text
+     x="23.644451"
+     y="150.61035"
+     text-anchor="end"
+     fill="#000000"
+     font-size="8.5px"
+     font-weight="600"
+     id="text36">Row 1</text>
+  <text
+     x="23.644451"
+     y="203.61035"
+     text-anchor="end"
+     fill="#000000"
+     font-size="8.5px"
+     font-weight="600"
+     id="text37">Row 2</text>
+  <text
+     x="23.644451"
+     y="256.61035"
+     text-anchor="end"
+     fill="#000000"
+     font-size="8.5px"
+     font-weight="600"
+     id="text38">Row 3</text>
+  <text
+     x="23.644451"
+     y="310.61035"
+     text-anchor="end"
+     fill="#000000"
+     font-size="8.5px"
+     font-weight="600"
+     id="text39">Row 4</text>
+  <text
+     x="23.644451"
+     y="363.61035"
+     text-anchor="end"
+     fill="#000000"
+     font-size="8.5px"
+     font-weight="600"
+     id="text40">Row 5</text>
+  <text
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+     y="416.61035"
+     text-anchor="end"
+     fill="#000000"
+     font-size="8.5px"
+     font-weight="600"
+     id="text41">Row 6</text>
+  <text
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+     y="470.61035"
+     text-anchor="end"
+     fill="#000000"
+     font-size="8.5px"
+     font-weight="600"
+     id="text42">Row 7</text>
+  <text
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+     y="523.61035"
+     text-anchor="end"
+     fill="#000000"
+     font-size="8.5px"
+     font-weight="600"
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+     y1="85.610352"
+     x2="183.64445"
+     y2="85.610352"
+     stroke="#000000"
+     stroke-width="0.75"
+     id="line43" />
+  <line
+     x1="146.84445"
+     y1="583.45038"
+     x2="183.64445"
+     y2="583.45038"
+     stroke="#000000"
+     stroke-width="0.75"
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+  <line
+     x1="183.64445"
+     y1="90.25563"
+     x2="183.64445"
+     y2="578.80505"
+     stroke="#000000"
+     stroke-width="1.18875"
+     marker-start="url(#arrow-start)"
+     marker-end="url(#arrow-end)"
+     id="line45"
+     style="marker-start:url(#Triangle);marker-end:url(#Triangle)" />
+  <g
+     transform="rotate(90,-69.44295,265.0874)"
+     id="g45">
+    <text
+       x="0"
+       y="0"
+       text-anchor="middle"
+       fill="#000000"
+       font-size="10.5px"
+       font-weight="700"
+       id="text45">177.8 mm (4U Panel Height)</text>
+  </g>
+  <!-- ================================================================= -->
+  <!-- VIEW 2: ZOOMED ORIGIN & PITCH DETAIL (TOP RIGHT)                  -->
+  <!-- ================================================================= -->
+  <text
+     x="493.64444"
+     y="9.6103516"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="13px"
+     font-weight="700"
+     id="text46">GRID ORIGIN &amp; PITCH DETAIL</text>
+  <text
+     x="493.64444"
+     y="25.610352"
+     text-anchor="middle"
+     fill="#666666"
+     font-size="10px"
+     id="text47"
+     style="fill:#000000;fill-opacity:1">(Enlarged View: Rows 1–2 / Scale 4.5 px/mm)</text>
+  <rect
+     x="408.14444"
+     y="90.610352"
+     width="171"
+     height="247.5"
+     fill="#f8fafc"
+     stroke="#000000"
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+     style="fill:#ffffff;fill-opacity:1" />
+  <line
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+     x2="451.00443"
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+     stroke-width="0.8"
+     stroke-dasharray="8, 3, 2, 3"
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+     x2="536.72449"
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+  <line
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+     x2="598.64447"
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+     x2="598.64447"
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+     stroke-dasharray="8, 3, 2, 3"
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+     stroke="#000000"
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+  <circle
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+     stroke="#000000"
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+  <circle
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+  <circle
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+     stroke="#000000"
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+  <text
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+     y="194.62035"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="11px"
+     font-weight="700"
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+  <text
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+     y="194.62035"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="11px"
+     font-weight="700"
+     id="text54">B1</text>
+  <text
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+     y="280.34534"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="11px"
+     font-weight="700"
+     id="text55">A2</text>
+  <text
+     x="536.72449"
+     y="280.34534"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="11px"
+     font-weight="700"
+     id="text56">B2</text>
+  <line
+     x1="408.14444"
+     y1="90.610352"
+     x2="408.14444"
+     y2="60.610352"
+     stroke="#000000"
+     stroke-width="0.75"
+     id="line56" />
+  <line
+     x1="451.00443"
+     y1="190.62035"
+     x2="451.00443"
+     y2="60.610352"
+     stroke="#000000"
+     stroke-width="0.75"
+     id="line57" />
+  <line
+     x1="412.78903"
+     y1="59.610352"
+     x2="447.14731"
+     y2="59.610352"
+     stroke="#000000"
+     stroke-width="1.07441"
+     marker-start="url(#arrow-start)"
+     marker-end="url(#arrow-end)"
+     id="line58"
+     style="marker-start:url(#Triangle);marker-end:url(#Triangle)" />
+  <text
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+     y="69.610352"
+     text-anchor="middle"
+     fill="#000000"
+     font-size="9px"
+     font-weight="700"
+     id="text58">Origin X: 9.525 mm</text>
+  <line
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+     y1="190.62035"
+     x2="536.72449"
+     y2="60.610352"
+     stroke="#000000"
+     stroke-width="0.75"
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+  <line
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+     x2="532.39539"
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+     marker-start="url(#arrow-start)"
+     marker-end="url(#arrow-end)"
+     id="line60"
+     style="marker-start:url(#Triangle);marker-end:url(#Triangle)" />
+  <text
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+     text-anchor="middle"
+     fill="#000000"
+     font-size="9px"
+     font-weight="700"
+     id="text60">Column Pitch: 19.05 mm (0.75&quot;)</text>
+  <line
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+     x2="358.64444"
+     y2="90.610352"
+     stroke="#000000"
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+     x2="358.64444"
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+     stroke="#000000"
+     stroke-width="0.75"
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+  <line
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+     y1="95.74807"
+     x2="357.64444"
+     y2="187.05763"
+     stroke="#000000"
+     stroke-width="1.14662"
+     marker-start="url(#arrow-start)"
+     marker-end="url(#arrow-end)"
+     id="line63"
+     style="marker-start:url(#Triangle);marker-end:url(#Triangle)" />
+  <text
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+     y="143.61035"
+     text-anchor="end"
+     fill="#000000"
+     font-size="9px"
+     font-weight="700"
+     id="text63">Origin Y: 22.225 mm</text>
+  <line
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+     y1="276.34534"
+     x2="358.64444"
+     y2="276.34534"
+     stroke="#000000"
+     stroke-width="0.75"
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+  <line
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+     y1="195.66405"
+     x2="357.64444"
+     y2="272.08914"
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+     marker-start="url(#arrow-start)"
+     marker-end="url(#arrow-end)"
+     id="line65"
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+       y="0"
+       text-anchor="middle"
+       fill="#000000"
+       font-size="9px"
+       font-weight="700"
+       id="text65">Row Pitch: 19.05 mm (0.75&quot;)</text>
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+  <!-- ================================================================= -->
+  <!-- VIEW 3: COMPONENT PLACEMENT RULES & HOLE SIZES (BOTTOM RIGHT)     -->
+  <!-- ================================================================= -->
+  <text
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+     text-anchor="middle"
+     fill="#000000"
+     font-size="13px"
+     font-weight="700"
+     id="text66">COMPONENT PLACEMENT &amp; HOLE SPECIFICATIONS</text>
+  <circle
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+     cy="415.61035"
+     r="16"
+     fill="#ffffff"
+     stroke="#000000"
+     stroke-width="1.5"
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+  <circle
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+     cy="415.61035"
+     r="8"
+     fill="none"
+     stroke="#000000"
+     stroke-width="1"
+     id="circle67" />
+  <line
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+     x2="363.64444"
+     y2="415.61035"
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+     stroke-dasharray="2, 2"
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+  <line
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+     x2="343.64444"
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+     stroke="#000000"
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+  <text
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+     y="413.61035"
+     fill="#000000"
+     font-size="10px"
+     font-weight="700"
+     id="text68">4 mm Banana Jack</text>
+  <text
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+     y="425.61035"
+     fill="#555555"
+     font-size="9px"
+     id="text69"
+     style="fill:#000000;fill-opacity:1">Grid Placement: Any Position (A1–B8)</text>
+  <text
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+     y="437.61035"
+     fill="#000000"
+     font-size="9px"
+     font-weight="600"
+     id="text70">Hole Size: ⌀ 8.0 mm</text>
+  <circle
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+     fill="#ffffff"
+     stroke="#000000"
+     stroke-width="1.5"
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+  <circle
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+     r="6"
+     fill="#cbd5e1"
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+  <line
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+     stroke="#000000"
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+     y2="490.61035"
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+  <text
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+     y="468.61035"
+     fill="#000000"
+     font-size="10px"
+     font-weight="700"
+     id="text72">6 mm Potentiometer Shaft</text>
+  <text
+     x="373.64444"
+     y="480.61035"
+     fill="#555555"
+     font-size="9px"
+     id="text73"
+     style="fill:#000000;fill-opacity:1">Grid Placement: Any Position (A1–B8)</text>
+  <text
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+     y="492.61035"
+     fill="#000000"
+     font-size="9px"
+     font-weight="600"
+     id="text74">Hole Size: ⌀ 7.0 mm</text>
+  <circle
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+     cy="415.61035"
+     r="6.4000001"
+     fill="#000000"
+     stroke="#000000"
+     stroke-width="1"
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+  <line
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+     y1="415.61035"
+     x2="608.64447"
+     y2="415.61035"
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+  <line
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+     stroke-width="0.5"
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+  <text
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+     y="413.61035"
+     fill="#000000"
+     font-size="10px"
+     font-weight="700"
+     id="text75">3 mm LED Indicator</text>
+  <text
+     x="611.64447"
+     y="425.61035"
+     fill="#555555"
+     font-size="9px"
+     id="text76"
+     style="fill:#000000;fill-opacity:1">Placement: Between Grid Positions</text>
+  <text
+     x="611.64447"
+     y="437.61035"
+     fill="#000000"
+     font-size="9px"
+     font-weight="600"
+     id="text77">Hole Size: ⌀ 3.2 mm</text>
+  <rect
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+     y="458.61035"
+     width="24"
+     height="24"
+     rx="3"
+     fill="#ffffff"
+     stroke="#000000"
+     stroke-width="1.2"
+     id="rect77" />
+  <circle
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+     cy="470.61035"
+     r="8"
+     fill="#cbd5e1"
+     stroke="#000000"
+     stroke-width="1"
+     id="circle77"
+     style="fill:#c0c0c0;fill-opacity:1" />
+  <line
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+     y1="455.61035"
+     x2="593.64447"
+     y2="485.61035"
+     stroke="#000000"
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+     stroke-dasharray="2, 2"
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+  <text
+     x="611.64447"
+     y="468.61035"
+     fill="#000000"
+     font-size="10px"
+     font-weight="700"
+     id="text78">Toggle Switch / Other</text>
+  <text
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+     y="480.61035"
+     fill="#555555"
+     font-size="9px"
+     id="text79"
+     style="fill:#000000;fill-opacity:1">Placement: Centered on Grid / Panel</text>
+  <text
+     x="611.64447"
+     y="492.61035"
+     fill="#000000"
+     font-size="9px"
+     font-weight="600"
+     id="text80">Hole Size: Per Component Spec</text>
+  <!-- ================================================================= -->
+  <!-- TECHNICAL NOTES SUMMARY BOX                                       -->
+  <!-- ================================================================= -->
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+        <cc:requires
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+      </cc:License>
+      <cc:Work
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+        <cc:license
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-- 
cgit