Waleed — Adom Molecule LED Nameplate

@@ -1,4 +1,4 @@-# Waleed — an Adom molecule LED nameplate+# Waleed: an Adom molecule LED nameplate  Waleed's name, **etched out of the soldermask over the ground plane**, lit by 14 side-view LEDs that fire inward across the board, powered from any@@ -9,12 +9,12 @@ pins on the 32 mm base-scaffold grid.  **The name is the ground plane.** A rectangular GND copper pour covers the top layer, and the soldermask is opened in the shape of the letters so bare plated-copper shows through. There is deliberately **no second ground path** — no-bottom ground pour — so every milliamp those 14 LEDs draw physically+copper shows through. There is deliberately **no second ground path** (no+bottom ground pour), so every milliamp those 14 LEDs draw physically crosses the letters on its way back to the connector. -So the line you get to say to Waleed — *"your name is part of the electrical-path that lights up the LEDs"* — is a statement about the netlist, not a+So the line you get to say to Waleed, *"your name is part of the electrical+path that lights up the LEDs"*, is a statement about the netlist, not a slogan. It is enforced by construction: the ground pour is sized to swallow every ground pad on the board, so ground is bonded by geometry and the autorouter is never given the chance to route a shortcut around the letters.@@ -27,7 +27,7 @@ autorouter is never given the chance to route a shortcut around the letters. | Pin box | **224 x 64 mm** = 7 x 2 on the 32 mm grid | | Name | 194.5 x 40 mm, Familjen Grotesk Bold | | Mask openings | 390 letter polygons |-| GND plate | 0.1 x 0.1 mm, top layer |+| GND plate | 229.6 x 69.6 mm, top layer | | LEDs | 14 x Würth WL-SMSW `155060GS75300`, 515 nm side-view | | Current | 168 mA @ 5 V (14 x 12 mA) | | Parts / traces / vias | 38 / 60 / 36 |@@ -39,11 +39,11 @@ and [base-scaffold-system](https://wiki.adom.inc/adom/base-scaffold-system):  - A **large machine pin at every corner** (3.6 mm body press-fit into a 3.45 mm   plated hole, 0.15 mm diametral interference).-- The pin box is **224 x 64 mm**, both exact multiples of 32 mm — the base-  scaffold's large-contact pitch — so it drops straight onto 8 x 3+- The pin box is **224 x 64 mm**, both exact multiples of 32 mm (the base+  scaffold's large-contact pitch), so it drops straight onto 8 x 3   contact positions of the 18 x 18 field across the 576 x 576 mm workspace. - **Minimal wings:** the board stops 6 mm outside each corner pin. That is as-  tight as the pin allows — a 5.2 mm annular ring eats 2.6 mm of it, leaving+  tight as the pin allows: a 5.2 mm annular ring eats 2.6 mm of it, leaving   3.4 mm of solid laminate, about 2x board thickness, which is what a press-fit   needs so insertion force does not crack the edge out. - Corner pins carry power, not just mechanics: **MP1/MP4 are GND, MP2/MP3 are@@ -55,7 +55,7 @@ and [base-scaffold-system](https://wiki.adom.inc/adom/base-scaffold-system):  A normal chip LED is a top-view emitter: it fires straight up, away from the board, and the copper you are trying to light sees nothing. This board uses a-true **side-view** part — the die sits on its side behind a window in the long+true **side-view** part. The die sits on its side behind a window in the long face of the package, so the beam leaves *parallel* to the board about 0.5 mm above the soldermask. Ringed around the edge facing inward, the light rakes across the plate at a grazing angle and washes the exposed-copper letters@@ -67,15 +67,15 @@ Worth knowing if you go sourcing: Kingbright's `APTR3216` family is and neither does this job.  - 1.6 x 0.8 x 1.1 mm; 2 pads 0.6 x 0.8 mm on 1.4 mm pitch-- 515 nm peak / 525 nm dominant, 260–560 mcd @ 20 mA, 140 deg 2θ½+- 515 nm peak / 525 nm dominant, 260 to 560 mcd @ 20 mA, 140 deg 2θ½ - VF 3.2 V typ; run here at 12 mA through 150 R  ## Power  USB-C VBUS (5 V) -> 150 R -> LED (3.2 V) = 12 mA each, **168 mA total**, well inside the 500 mA a charger gives an unnegotiated sink, so any phone brick-works. `R_CC1`/`R_CC2` are the mandatory Rd pulldowns — without them on *both*-CC lines a USB-C source never enables VBUS at all and the board is simply dead.+works. `R_CC1`/`R_CC2` are the mandatory Rd pulldowns. Without them on *both*+CC lines a USB-C source never enables VBUS at all and the board is dead.  Layer plan is inverted from the usual convention on purpose: @@ -91,33 +91,33 @@ plane, while the cathode bonds straight into the plate. | Ref | Qty | Part | Package | |---|---:|---|---| | D* | 14 | Würth WL-SMSW `155060GS75300` side-view green 515 nm | 0603 side-view |-| R1–R14 | 14 | 150 R ±1 % `CR0402-FX-1500GLF` | 0402 |+| R1 to R14 | 14 | 150 R ±1 % `CR0402-FX-1500GLF` | 0402 | | R_CC1/2 | 2 | 4.7 k ±1 % `CR0402-FX-4701GLF` | 0402 | | C1 | 1 | 10 µF X5R `0603X106K100CT` | 0603 | | C2 | 1 | 100 nF X7R `0402B104J160CT` | 0402 | | J1 | 1 | `TYPE-C-31-M-12` USB-C (JLC C165948) | SMD + 4 plated anchors |-| MP1–MP4 | 4 | `MachinePinLargeStandard` | 3.45 mm plated hole |+| MP1 to MP4 | 4 | `MachinePinLargeStandard` | 3.45 mm plated hole |  Passives are all Adom Basic Parts. The LED is Mouser/DigiKey (~$0.40).  ## Fab notes  - **Specify ENIG, not HASL.** The letters are 194 x 40 mm of deliberately-  bare copper and are the entire point of the board; HASL leaves them lumpy,+  bare copper and are the entire point of the board. HASL leaves them lumpy,   ENIG leaves them mirror flat. - Dark soldermask maximises contrast against the exposed letters. - The four 3.45 mm machine-pin holes are an **interference fit** and are meant-  to be undersized — do not let a fab house "correct" them to a clearance fit.+  to be undersized. Do not let a fab house "correct" them to a clearance fit. - Tented/plugged vias: there are vias whose rings lap onto LED resistor pads. -## Verifying the mask really opens+## Verifying the mask opens -Do not trust the render — read the gerber. `F_Mask.gbr` is negative polarity+Do not trust the render. Read the gerber. `F_Mask.gbr` is negative polarity (`%TF.FilePolarity,Negative*%`), so what is *drawn* is where mask is *removed*: -- **390 region polygons**, bounding box **194.45 x 40.00 mm** — the letters+- **390 region polygons**, bounding box **194.45 x 40.00 mm**, the letters - the plate rectangle **absent** from F_Mask (present would mean inverted)-- **zero** letter regions in `F_Paste.gbr` — the letters are decoration, not+- **zero** letter regions in `F_Paste.gbr`. The letters are decoration, not   solder joints, and must never be stencilled  ## Reproducing it