# Turn a tabletop into a football pitch

A camera tracks physical markers on a projected football pitch.

## Hardware
Windows 11 PC; projector; 1080p webcam; matte board

A projector draws the pitch while a webcam tracks a physical marker, translating movement on the tabletop into game input.

## Shopping list

Parts describe the original Football build. Rescan and recalibrate after moving the board, camera or projector; optional later game modes may require a microphone or different input markers.

Quantities are for one build. Unless marked source-specified, they are planning quantities; confirm kit contents and the chosen configuration before ordering.

### Confirm before buying
- Projector SKU, camera SKU and mounting geometry are not specified.

### 1 × Windows 11 x64 PC
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Run the projection game.
- Sourcing: No exact purchase link verified; confirm the model and requirements above before ordering.
- Evidence: Creator source
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-3ccbfc5367ce49fc8fc2fcfda105ccaf9711a8609f4db8beaa74addbecfc6abb
- Source: https://github.com/abiemann/ProjectTabletop

### 1 × Projector
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Extended desktop output.
- Notes: Exact model and throw ratio not specified.
- Sourcing: No exact purchase link verified; confirm the model and requirements above before ordering.
- Evidence: Creator source
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-3ccbfc5367ce49fc8fc2fcfda105ccaf9711a8609f4db8beaa74addbecfc6abb
- Source: https://github.com/abiemann/ProjectTabletop

### 1 × Windows-compatible 1080p webcam
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Track the board and markers.
- Notes: Baseline source requires 1080p. A later repository discussion of Facecam 4K is not a universal hardware validation.
- Sourcing: No exact purchase link verified; confirm the model and requirements above before ordering.
- Evidence: Creator source
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-3ccbfc5367ce49fc8fc2fcfda105ccaf9711a8609f4db8beaa74addbecfc6abb
- Source: https://github.com/abiemann/ProjectTabletop

### 1 × Matte-white presentation board
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Playing surface with visible edges.
- Sourcing: No exact purchase link verified; confirm the model and requirements above before ordering.
- Evidence: Creator source
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-3ccbfc5367ce49fc8fc2fcfda105ccaf9711a8609f4db8beaa74addbecfc6abb
- Source: https://github.com/abiemann/ProjectTabletop

### 1 per player × Printed two-parallel-black-bar marker
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Human player input.
- Notes: One or two players in the documented Football setup.
- Sourcing: No exact purchase link verified; confirm the model and requirements above before ordering.
- Evidence: Creator source
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-3ccbfc5367ce49fc8fc2fcfda105ccaf9711a8609f4db8beaa74addbecfc6abb
- Source: https://github.com/abiemann/ProjectTabletop

### Set × Video cable / adapter and stable mounts
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Connect projector and aim projector/camera at the same board.
- Notes: Use the PC/projector ports and actual room geometry; camera must see the entire board and margin.
- Sourcing: Use existing equipment or match the specification above. No exact purchase link verified.
- Evidence: Setup requirement — check against your configuration
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-3ccbfc5367ce49fc8fc2fcfda105ccaf9711a8609f4db8beaa74addbecfc6abb
- Source: https://github.com/abiemann/ProjectTabletop

### 1 × Projector power supply
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Power the device.
- Notes: Use the projector’s correct supply.
- Sourcing: Use existing equipment or match the specification above. No exact purchase link verified.
- Evidence: Setup requirement — check against your configuration
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-3ccbfc5367ce49fc8fc2fcfda105ccaf9711a8609f4db8beaa74addbecfc6abb
- Source: https://github.com/abiemann/ProjectTabletop

Source reviewed, not assembled or hands-on tested. A working product page does not confirm stock, firmware compatibility or a complete build.

## Setup
Multi-device setup

## Coding tool
Codex

## How the agent helped
The creator says the application was built and refined with Codex, including mapping the camera's marker positions onto the projected playing surface. Later versions are part of this same project.

## Before you build
Requires camera/projector calibration and printed markers. Version 1.3 is the same project and is not counted separately.

## Sources
- Original build: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-3ccbfc5367ce49fc8fc2fcfda105ccaf9711a8609f4db8beaa74addbecfc6abb
- Supporting source: https://github.com/abiemann/ProjectTabletop

Source reviewed 2026-11-04. Not hands-on tested.