SportsDesign rev S, 27 Oct 2026: the whole product inside the goal at Law 1 size; CAD, fit checks and assembled 3D pitch done; not built

FootballOne

IEMI's one football product: a smart goal pair whose posts see goals, shots, headers and the keeper count, keep the match clock and feel the goal tilt

IEMI's one football product is the goal itself (rev S). Two posts and a crossbar at IFAB Law 1 size carry everything: an AI camera and a Pi Zero 2 W at the top of each post, four cells and a charger in each post foot, and a radio with a motion sensor in the crossbar. The goal sees the ball cross the line and buzzes the referee, logs shots, saves and headers at goal, counts the keeper's seconds, runs the match clock and sin bins, and alarms if the goal tilts. The referee wrist unit is the one detachable part and docks in the back of the left post.

Who buys it: Grassroots and youth football clubs with their own pitch (UK, US, Europe), academies and schools that buy goals and run training and match days.
Why it pays: $4,690 for a pair instead of about $7,214: our GoalSide, SmartGoal Academy and OffsideFlag kits ($4,814 + $150/month) plus a plain pair of full-size aluminium goals (about $2,400, est.).
Target price: $4,690 FootballOne (two smart goals with sockets and the referee wrist unit) + $29/month Club Clips optional (target)
First-minute wow: A scramble on the line, the referee 30 m away: the wrist buzzes GOAL? before the players have turned round, the referee presses GOAL and the coach's phone reads 2-1 with the clip. Nothing on the pitch but the goals.

See the CAD design Concept page

FootballOne concept: the idea and where each part goes — The concept. The CAD design is below, under Printable CAD.

What the research found

And how this design answers it

Rev O (28 Oct 2026): the goal is its own referee. A goal-line camera in each post calls goal or no goal, goal kicks and corners near the goal and the penalty keeper rule; the post cameras call the 8-second keeper hold; light bands and a horn in every post show each call; a secure element signs every call; unsure calls go to the coaches
Rev S (27 Oct 2026): the pitch-side Edge Hub, access-point stand, post saddles, bank boxes, HeadCount pod, SinBin board, QuarterBoard, flag grips and RefCam → one smart goal pair; every job runs inside the posts and crossbar
Pi 5 + Hailo hub and two Camera Module 3 GoalCams → a Pi Zero 2 W and an AI camera (the model runs on the sensor) at the top of each post
Hand-counted keeper seconds on the wrist → the post cameras count the keeper's hold and buzz the wrist at 5 and 8 s
New: crossbar motion sensor for woodwork hits and a tilt alarm on the goal
Halfway boards, flags and RefCam → listed as gaps; times show on the wrist and in the app
Price $3,990 + $150/month for one goal → $4,490 for a full pair of smart goals + $29/month optional

Use case

Tuesday finishing drill, then Saturday under-14 league game

RefereeCoachClub volunteer

01Trigger: a scramble on the home goal line, the referee 30 m away
02Detection: both post cameras see the whole ball over the line
03Alert: the wrist buzzes GOAL?; the referee presses GOAL
04Action: the coach's phone shows 2-1 with the clip; later the away keeper holds 8 s and the wrist buzzes at 5 and 8

Outcome: One product, the goals the club already sockets, and one app; $4,690 instead of about $7,214 (est.)

How it works

Architecture

01
Sense: AI camera at the top of each post, motion sensor in each crossbar, wrist unit keys
02
Decide: the home left post Pi Zero 2 W runs goal, shot, header, keeper-count, clock, sin-bin and tilt rules
03
Send: Wi-Fi access point and MQTT to the coach's phone; USB through the crossbar to the right post; BLE to the wrist unit and the away goal
04
Tell: wrist buzz and screen, the FootballOne app

Hardware

Real parts, buyable today

Bill of materials: about $2,806 per FootballOne pair at qty 1 (both goal frames, electronics and the wrist unit; bom.csv, frames est.).

Block	Part	Why this part
Brain	Raspberry Pi Zero 2 W at the top of each post (home left post leads)	Fits inside the 114 x 94 tube and runs the rules
Camera	Raspberry Pi AI Camera (Sony IMX500) behind a flush window	Runs the ball and pose model on the sensor, so a small Pi is enough
Crossbar	Seeed XIAO nRF52840 Sense (IMU + BLE) and one 18650 cell	Feels woodwork hits and tilt; BLE long range to the other goal and the wrist
Power	4 x Samsung INR18650-35E + Adafruit PowerBoost 1000C in each post foot	About 19.5 h per post: a tournament day (est.)
Frame	6063-T6 aluminium oval 120 x 100 x 3, white, in ground sockets	The legal goal itself: Law 1 size, colour and shape
Referee wrist unit	Seeed XIAO ESP32-C3, Waveshare 1.54 in e-paper, coin motor, 3 keys, 500 mAh	The one detachable part: buzz, clock and sin bins on the referee's wrist

Mechanical

Printable CAD

10 parts, generated from code and checked as closed solids. Pick a part to inspect it, or download the STL files to print.

Loading the CAD…

Real CAD · drag to rotate · scroll to zoomReal CAD · swipe sideways

Open risks we are working on

The goal cameras are not certified Goal Line Technology; the referee decides every goal, and leagues must accept the wrist alerts
A 400 g ball at 100 km/h hits the posts: the boards inside the posts and the window discs need impact tests
Aluminium blocks radio: each radio sits behind a flush window; BLE long range between goals 100 m apart is untested
Keeper-count and header counts from the post cameras (est.) are untested; the coach and referee check every alert
Clips of children need the club's safeguarding sign-off before sharing
Offside, assistant flags, body camera and halfway boards are gaps of a goal-only product

Design stage only: nothing on this page is for sale. Specifications and prices are targets.