# ChatGPT render prompt — ECW (Exact-Change Wallet) **Before prompting:** export SVGs to PNG and **upload as reference images**: - `card-slice-top.png` - `card-slice-edge.png` - `full-wallet-tray-ui.png` Prompt text alone will produce **binary slide switches** instead of **rotary wheels**. The reference PNGs are mandatory. --- ## Master prompt (2×2 product sheet) ``` Photorealistic ECW (Exact-Change Wallet) product design sheet — 2×2 grid, neutral light-gray studio background. Match the UPLOADED REFERENCE LAYOUTS exactly for control placement and coin counts. REFERENCE: I uploaded orthographic faceplates. Do NOT invent slide switches, toggle switches, or hinge-mounted keypads. ═══════════════════════════════════════════════════ COIN TRAY (ALL PANELS) ═══════════════════════════════════════════════════ Row 1: THREE quarters (Washington, ~24.3 mm) Row 2: TWO dimes (Roosevelt, SMALLEST ~17.9 mm) + ONE nickel (Jefferson, ~21.2 mm, WIDER) — order D·D·N NEVER three dimes. NEVER zero nickels. Row 3 penny SKUs (A, C): FOUR pennies in 2×2 grid (Lincoln ~19.1 mm) Row 3 dollar SKUs (B, D): ONE golden Sacagawea $1 (~26.5 mm), centered — NO pennies Ten amber coin LEDs — one under each slot thumb edge. Tray ~77×90 mm (penny) or ~77×76 mm (dollar). Slice thickness 5–6 mm; Wallet 8–10 mm closed. ═══════════════════════════════════════════════════ BILL INDICATOR — PROMINENT ═══════════════════════════════════════════════════ NOT a tiny dot on the tray top. Use a WHITE/BLUE GLOWING HALO RING around the numeric display when "BILL+" is active. The halo is part of the display stack — impossible to miss. When inactive: faint ring or off; when active: bright ring + display may show handover (e.g. 21.14 vs 20.24). ═══════════════════════════════════════════════════ CARD SLICE (Panels A & B) — ROTARY WHEELS ONLY ═══════════════════════════════════════════════════ Right edge rail (~18 mm wide), control stack top→bottom: 1. Display "5.99" or "20.24" with BILL HALO ring around it 2. Knurled ROTARY THUMB WHEEL ~12 mm, label "$", spins 0–99 whole dollars 3. Knurled ROTARY THUMB WHEEL ~12 mm, label "¢", spins 0–99 cents Wheels are ROUND and SPIN — like a camera dial or DJ knob — NOT linear slide switches. NOT toggle switches. NOT INT/¢ slide rails. NO minus button. NO plus button. NO GO button anywhere on A or B. Side profile inset: wheels protrude ~1 mm from edge rail; slab ~5.5 mm total. Panel A label: "A · Slice · Penny · rotary wheels" Panel B label: "B · Slice · Dollar · rotary wheels" ═══════════════════════════════════════════════════ FULL WALLET (Panels C & D) — DISPLAY STACK ═══════════════════════════════════════════════════ NO rotary wheels on wallet panels. NO sliders. UI block at TOP-RIGHT of coin-tray leaf (above coin rows): ┌─────────────────┐ │ ○ BILL HALO ○ │ │ 20.24 │ │ [ $ ] [−] [+] │ ← DIRECTLY under display └─────────────────┘ Panel C (Penny): display stack + three buttons only. Black bifold; cards/ID/bills on left leaf. Panel D (Dollar Plus): same stack + 3×4 numeric keypad (0–9, C) DIRECTLY BELOW the three buttons — still on tray rim, NOT on wallet center hinge, NOT on far edge. Bill halo on display — NOT on bill pocket alone. Panel C label: "C · Wallet · Penny · buttons under display" Panel D label: "D · Wallet · Dollar Plus · keypad under buttons" Panel E (Hybrid Plus): UPLOAD full-wallet-hybrid.png — 11 coins, 120 mm tray: Row 1: 3Q | Row 2: 2D+1N | Rows 3-4: 4P in 2×2 | Row 5: 1× golden $1 centered. UI rail RIGHT of tray (77 mm coins + 20 mm UI column, NO overlap). Keypad under $ − + like Panel D. 204 cents face. WALLET ONLY — no slim Card Slice for all coins. Legend bar: "No app · No Bluetooth · CR2032 · Amber LED = take coin · Blue/white halo = add ≥$1 paper · Slice = spin wheels · Wallet = buttons under display" Style: Dieter Rams / Braun minimal EDC. Matte charcoal polymer + black leather. No touchscreen. No motorized dispensers. ``` --- ## Single-panel prompts (iterate one at a time) ### Slice Penny only ``` Photorealistic ECW Card Slice, 3/4 product angle + side profile inset. UPLOAD card-slice-top.png + card-slice-edge.png as reference — match layout exactly. ROTARY knurled thumb wheels on right edge (round, spin 0–99) — NOT slide switches. Stack: display with blue BILL HALO ring → $ wheel → ¢ wheel. Coins: 3Q, 2D+1N (nickel wider than dimes), 2×2 pennies. NO −/+ buttons. NO GO. ~102×67×5.5 mm charcoal slab. ``` ### Full Wallet Penny only ``` Photorealistic ECW Full Wallet bifold open. UPLOAD full-wallet-tray-ui.png. Top-right of tray leaf: display with BILL HALO ring, then $ − + buttons DIRECTLY UNDER display. NO wheels. NO hinge buttons. NO GO. Coins: 3Q, 2D+1N, 2×2 pennies. Amber slot LEDs. Left leaf: cards, ID, $20 bill. ``` ### Full Wallet Hybrid (Panel E) ``` Photorealistic ECW Full Wallet bifold open. UPLOAD full-wallet-hybrid.png. 11-coin hybrid tray (120 mm tall): 3Q, 2D+1N, 4P in 2×2, then 1× golden Sacagawea $1 on bottom row. 77 mm coin tray LEFT + 20 mm UI rail RIGHT — no overlap between coins and display. Display stack + keypad (like Dollar Plus): halo → readout → $ − + → 0-9 keypad. Amber LED under each of 11 slots. ``` --- ## Common failures (reject and re-prompt) | Wrong | Correct | |-------|---------| | Linear INT/¢ slide switches | **Knurled rotary wheels** | | − / + / GO on Card Slice | **Wheels only** on Slice | | Buttons on wallet far edge or hinge | **Display stack top-right of tray** | | Tiny $ LED on tray top | **Halo ring around display** | | 3 dimes, 0 nickels | **2 dimes + 1 nickel** | | Keypad on center fold (D) | **Keypad below $−+ on tray rim** |