9.3 KiB
created, modified, type, tags, aliases
| created | modified | type | tags | aliases | |
|---|---|---|---|---|---|
| 2026-07-07 22:05 | 2026-07-07 22:05 | note |
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Digital Binoculars
DIY Face-Mounted Digital HDMI Viewfinder (Obsidian Technical Note)
- Date: 2026-07-07
- Project Type: Hardware Fabrication / Near-to-Eye (NTE) Display Assembly
- Objective: Create a direct, zero-latency digital viewfinder using a 2K LCD screen over HDMI from a digital camera with optical zoom, bypassing all wireless hardware.
🛠️ Step 1: Optical Procurement (AliExpress)
Do not use basic magnifying glasses or generic Google Cardboard lenses. A high-density 2K display requires specialized optics to prevent warping and extreme chromatic aberration.
AliExpress Search Targets
- Search Query 1:
50mm Aspheric PMMA Lens FPV - Search Query 2:
40mm Bi-Convex VR Lens - Search Query 3:
Phone VR Headset Replacement Lenses
Optical Specifications Needed
- Lens Material: Aspheric or Bi-Convex PMMA (acrylic) or optical glass. Aspheric is highly preferred for 2K resolution to keep edge-to-edge clarity sharp.
- Target Focal Length: Between 45mm and 60mm. This keeps the physical depth of your 3D-printed housing short, shallow, and lightweight on your face.
📐 Step 2: Open-Source CAD Data Selection
Instead of designing a facial interface and optical box from scratch, leverage established open-source CAD repositories and upload the .STL or .STEP files directly to a fabrication service like PCBWay or JLCPCB.
Top Repository Recommendations
- The "Relativity VR" / DIY_VR Platform (Recommended for Makers)
- Source: Search GitHub for the
dmcke5 DIY_VRrepository. - Why it fits: It is an open-source project explicitly designed for makers building low-cost, high-resolution HDMI headsets using AliExpress screens. The "Eyebox" pieces are engineered to mount dual lenses at an exact sliding focal distance right in front of compact LCD panels.
- Source: Search GitHub for the
- The OpenIPC "PixelPilot" Shell
- Source: Search Printables or Thingiverse for
OpenIPC PixelPilot Goggle Body. - Why it fits: This is a field-tested, modern shell designed to hold small, high-density displays. It includes mechanical sliders so you can adjust your IPD (Interpupillary Distance) manually.
- Source: Search Printables or Thingiverse for
🏭 Step 3: Manufacturing Configuration (PCBWay / JLCPCB)
When configuring your order on a 3D printing platform, use these specific parameters to ensure the build survives active use:
| Component / Section | Recommended Material | Print Technology | Reason |
|---|---|---|---|
| Main Goggle Body / Face Plate | Nylon (PA12) or PETG | SLS (Selective Laser Sintering) | Provides durable, impact-resistant structures that won't warp under outdoor heat. |
| Internal Lens Holders & Mounts | Matte Black Resin or Matte PLA | SLA (Stereolithography) or FDM | Crucial: Matte black prevents internal light bounce and reflections into your eyes. |
🔌 Step 4: Hardware Architecture & Wiring Pipeline
Because you are bypassing wireless modules entirely, your minimal hardware pipeline is streamlined for zero latency: [Digital Camera]│ (Clean HDMI Output @ 60fps)▼[Flexible HDMI Cable]│▼[Display Driver Board (Mounted to Shell/Strap)]│ (FPC Ribbon Cable)▼[2K LCD Screen] ───> [Aspheric Lenses] ───> [User Eyes]
Critical Rules for the Build
- Clean HDMI Output: Ensure your camera supports "Clean HDMI" (sends the video feed without on-screen battery icons or menu text).
- The Diopter Constraint: You cannot look directly at micro-displays without optics. The shell must house your sourced lenses at an exact distance matching their focal length (
f \approx d_o) so your eyes can focus effortlessly. - Power Delivery: Tie a portable USB power bank to the display driver board via a simple USB-C cable or 5V DC step-down regulator.
1. The Displays & Driver (AliExpress / eBay) *
Sourced Module: Wisecoco 2.9 Inch 1440x1440 Dual LCD Display Screen Kit (Model: Sharp LS029B3SX02). * Included Hardware: 2x 2.9" Square LCD Panels (with backlights) + 1x Dual MIPI HDMI Driver Board. * Interface: Single Full-Size HDMI Input / Powered via 5V Micro-USB or USB-C.
SECOND APPROACH
Stadium Viewfinder Goggles (Commercial MVP Technical Note)
- Date: 2026-07-07
- Project Type: Hardware Fabrication / Commercial Product Blueprint
- Objective: Create a direct, zero-latency stadium viewfinder using a high-brightness 5-inch 1080p display over HDMI from a 5x optical zoom camera. This setup provides an affordable, wide-angle cinematic view for live sports and concerts without complex wireless hardware or dual-screen software splitting.
🛠️ Step 1: Optical Sourcing & Selection (AliExpress)
To ensure this product is low-cost and easy for users to look into, the architecture relies on a single-screen "box goggle" configuration. This layout uses one shared lens instead of separate eyepieces.
AliExpress Search Targets
- Search Query 1:
5 inch FPV box goggle replacement Fresnel lens - Search Query 2:
3x magnification PVC Fresnel lens sheet - Search Query 3:
Credit card magnifier Fresnel lens 3x
Optical Specifications Needed
- Lens Material: Optical-grade Acrylic or PVC Fresnel sheet.
- Magnification Factor: 3x magnification.
- Target Profile: Flat, ultra-lightweight rectangular sheet cut to fit the internal width of the goggle shell (~120mm x 70mm). This configuration allows both eyes to focus on a single large canvas simultaneously, preventing double vision.
📐 Step 2: Open-Source CAD Data Selection
Instead of designing a facial interface and optical box from scratch, leverage established open-source CAD repositories for box goggles and upload the .STL or .STEP files directly to a fabrication service like PCBWay or JLCPCB.
Top Repository Recommendations
- The Eachine EV800 / EV800D Open Source Shell
- Source: Search Thingiverse or Printables for
Eachine EV800 Upgrade ShellorDIY FPV Box Goggle Case. - Why it fits: This form factor is explicitly engineered for a single 5-inch screen and a front-mounted rectangular Fresnel lens. It offers excellent ergonomics and safely clears eyeglasses.
- Source: Search Thingiverse or Printables for
- The Quanum DIY FPV Goggle V2 Chassis
- Source: Search GrabCAD or Thingiverse for
Quanum DIY Goggle V2. - Why it fits: A classic, deep-box layout that provides the exact focal distance required to focus comfortably on a 5-inch panel without eye strain.
- Source: Search GrabCAD or Thingiverse for
🏭 Step 3: Manufacturing Configuration (PCBWay / JLCPCB)
When configuring your production order on a 3D printing platform, use these specific parameters to ensure the product survives outdoor stadium environments:
| Component / Section | Recommended Material | Print Technology | Reason |
|---|---|---|---|
| Main Goggle Body / Face Plate | Nylon (PA12) or PETG | SLS (Selective Laser Sintering) | Provides durable, impact-resistant structures that won't warp under outdoor stadium heat. |
| Internal Lens Grooves & Mask | Matte Black Resin or Matte PLA | SLA (Stereolithography) or FDM | Crucial: Matte black absorbs light bounce, stopping daylight reflections from washing out the screen. |
🔌 Step 4: Hardware Architecture & Sourcing Checklist
This pipeline bypasses wireless modules and Raspberry Pi video processing, achieving direct hardware compilation with absolute zero latency.
Sourcing Specifications
- Display Module:
5.0 Inch 1080p HDMI LCD Monitor Module with Backlight(Ensure it is rated for 800 to 1000 nits of brightness for daylight visibility). - Camera Module:
5x Optical Zoom Camera Block with HDMI Output(Provides stable tracking that matches natural human head movement limits of 90°–120°/sec).
System Diagram
Use code with caution.
[ Front Brim Mounted 5x Zoom Camera ]
│
▼ (Direct Hardware Micro-HDMI to HDMI Cable)
┌───────────────────────────────────────────────────────────┐
│ [ 5-Inch High-Bright HDMI LCD Panel ] │
│ (Built-in Backlight, Powered via 5V USB) │
└───────────────────────────────────────────────────────────┘
│
▼ (Image cast across full screen canvas)
[ Single Rectangular 3x Fresnel Lens Sheet ]
│
▼
[ User Vision ] (Immersive, wide-angle stadium view)
Critical Rules for Commercial Assembly
- The Focal Alignment Rule (
f \approx d_o): The single Fresnel lens sheet must be positioned inside the internal shell slots at the exact distance where the 5-inch screen drops into perfect focus for the average user (typically 65mm–85mm from the eye line). - Clean HDMI Output: Ensure the 5x camera block firmware is set to output a clean video signal without battery icons, crosshairs, or settings overlays showing up on the user's screen.
- Power Delivery Integration: Power the display driver board via a standard 5V USB-C tether line running to a pocket-sized portable power bank. Trigger the camera's zoom motor using a hand-held remote control containing a simple, mechanical rocker switch.