Drone Motor Carrier

@@ -0,0 +1,56 @@+# Motor Carrier v1.1 — Function++104 × 104 mm, 4-layer JLC04161H-7628, 2.000 mm corner arcs. Machine-pin datum 96.000 × 96.000 mm.++Carries the motor, passes the three phases from the ESC through to the motor leads, and hosts the+RP2350A+ADS1220 molecule (N2) and a PiProbe (N1).++## Analogue routing++The machine contacts sit **upstream** of the molecule's RC filter, so anything the carrier picks up+arrives unfiltered at the bridge's 350 Ω source. The layout follows from that:++- Pair pitch **0.450 mm, constant over the entire run** on both channels+- Lengths 22.75 / 23.47 mm (ch1) and 44.08 / 43.31 mm (ch2)+- All four pairs on B.Cu, no vias, referenced to In2 GND 0.2104 mm away+- In2 plane coverage 91–96 %; every gap is a pad antipad+- Nearest same-layer neighbour 2.04–3.08 mm; nearest phase copper 4.53 mm+- Digital crossings run on F.Cu with two GND planes between++`+5V_REF1` and `+5V_REF2` are separate nets with **no carrier-side tie to `+5V`**. They merge only+inside the molecule. See `03-Molecule/Overview.md` for the ratiometric topology this preserves.++## UART arbitration++The FC and the nested PiProbe both reach the molecule's RX line. debugprobe drives its UART TX from+power-up regardless of USB enumeration, so a populated probe holds that pin continuously.++```+Net-(N1-TX) : N1.9 (PiProbe TX), R1.1          two pads only+/UART0_RX   : MC18 (FC), N2.14 (molecule RX), R1.2+```++**R1 = 300R 0603 1 %** sits on a 4.31 mm stub in the PiProbe branch alone. The probe reaches the net+only through R1; the FC and the molecule's RX connect directly.++```+contention    3.3 / (300 + 50 + 50)  =  8.25 mA+R1 dissipates 300 x 8.25mA^2         =  20 mW of 100 mW+FC drives 0   3.3 x 50/400           =  0.41 V   valid LOW+```++R1 is not in the BOM — it has no LCSC field.++## Phase path++Three large contacts (Ø2.62 hole / Ø4.40 ring, ~20.8 A each), one per phase, into a 4-layer pour+with **49 vias at 2 mm pitch** per phase, out to 8 × 8 mm wire pads with a 2.0 mm hole.++Phase copper is 12.02 mm × 4 layers = **1.207 mm², 0.214 mΩ** over the 15 mm run.++## Harness rules++- `/nRST` reaches both MC16 (FC) and MC13 (Scaffold). Wire one end only, or make both open-drain.+  There is no external pull-up on either board — only the RP2350's internal 32–86 kΩ.+- `/SWD` and `/SWCLK` on MC22/MC24 are an external-probe landing. Keep them out of the FC harness.+- `/I2C0_SCL` and `/I2C0_SDA` on MC20/MC21 have no destination; the FC carrier has no I2C contacts.

@@ -1,4 +1,4 @@-<meta charset="utf-8">+<style>.overview-doc{font-size:14px;line-height:1.6}.overview-doc table{border-collapse:collapse;margin:10px 0}.overview-doc th,.overview-doc td{border:1px solid rgba(128,140,160,.3);padding:4px 10px;text-align:left}.overview-doc pre{background:rgba(128,140,160,.12);padding:10px;border-radius:6px;overflow-x:auto;font-size:12.5px}.overview-doc code{font-family:ui-monospace,monospace}</style><meta charset="utf-8"> <title>Feeder Reader — Feeder Pin Input Module</title> <style>   :root{ --bg:#151b23; --card:#1b232d; --ink:#e8eef5; --dim:#9fb0c3; --dim2:#7f92a6;@@ -621,6 +621,53 @@ addEventListener('resize', () => scene.getEngine().resize());     </div>   </div> +  +  <h2>Project overview</h2>+  <p class="prov">From the project's own overview document (author-written).</p>+  <div class="overview-doc">+<h1>Motor Carrier v1.1 — Function</h1>+<p>104 × 104 mm, 4-layer JLC04161H-7628, 2.000 mm corner arcs. Machine-pin datum 96.000 × 96.000 mm.</p>+<p>Carries the motor, passes the three phases from the ESC through to the motor leads, and hosts the+RP2350A+ADS1220 molecule (N2) and a PiProbe (N1).</p>+<h2>Analogue routing</h2>+<p>The machine contacts sit <strong>upstream</strong> of the molecule's RC filter, so anything the carrier picks up+arrives unfiltered at the bridge's 350 Ω source. The layout follows from that:</p>+<ul>+<li>Pair pitch <strong>0.450 mm, constant over the entire run</strong> on both channels</li>+<li>Lengths 22.75 / 23.47 mm (ch1) and 44.08 / 43.31 mm (ch2)</li>+<li>All four pairs on B.Cu, no vias, referenced to In2 GND 0.2104 mm away</li>+<li>In2 plane coverage 91–96 %; every gap is a pad antipad</li>+<li>Nearest same-layer neighbour 2.04–3.08 mm; nearest phase copper 4.53 mm</li>+<li>Digital crossings run on F.Cu with two GND planes between</li>+</ul>+<p><code>+5V_REF1</code> and <code>+5V_REF2</code> are separate nets with <strong>no carrier-side tie to <code>+5V</code></strong>. They merge only+inside the molecule. See <code>03-Molecule/Overview.md</code> for the ratiometric topology this preserves.</p>+<h2>UART arbitration</h2>+<p>The FC and the nested PiProbe both reach the molecule's RX line. debugprobe drives its UART TX from+power-up regardless of USB enumeration, so a populated probe holds that pin continuously.</p>+<pre><code>Net-(N1-TX) : N1.9 (PiProbe TX), R1.1          two pads only+/UART0_RX   : MC18 (FC), N2.14 (molecule RX), R1.2+</code></pre>+<p><strong>R1 = 300R 0603 1 %</strong> sits on a 4.31 mm stub in the PiProbe branch alone. The probe reaches the net+only through R1; the FC and the molecule's RX connect directly.</p>+<pre><code>contention    3.3 / (300 + 50 + 50)  =  8.25 mA+R1 dissipates 300 x 8.25mA^2         =  20 mW of 100 mW+FC drives 0   3.3 x 50/400           =  0.41 V   valid LOW+</code></pre>+<p>R1 is not in the BOM — it has no LCSC field.</p>+<h2>Phase path</h2>+<p>Three large contacts (Ø2.62 hole / Ø4.40 ring, ~20.8 A each), one per phase, into a 4-layer pour+with <strong>49 vias at 2 mm pitch</strong> per phase, out to 8 × 8 mm wire pads with a 2.0 mm hole.</p>+<p>Phase copper is 12.02 mm × 4 layers = <strong>1.207 mm², 0.214 mΩ</strong> over the 15 mm run.</p>+<h2>Harness rules</h2>+<ul>+<li><code>/nRST</code> reaches both MC16 (FC) and MC13 (Scaffold). Wire one end only, or make both open-drain.+  There is no external pull-up on either board — only the RP2350's internal 32–86 kΩ.</li>+<li><code>/SWD</code> and <code>/SWCLK</code> on MC22/MC24 are an external-probe landing. Keep them out of the FC harness.</li>+<li><code>/I2C0_SCL</code> and <code>/I2C0_SDA</code> on MC20/MC21 have no destination; the FC carrier has no I2C contacts.</li>+</ul>+  </div>+   <h2>What it does</h2>   <p>A passive carrier baseplate. It mounts the BLDC motor, passes the motor's three phases straight   through from the ESC to the motor leads, routes two load-cell channels, and <b>nests the RP2350A +

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