RacketOne

How it fits together

RacketOne, part by part

Scroll or tap a part. Press “See the 3D CAD design” to watch the model, built from our CAD, light each part up and show how it connects.

See the 3D CAD designShow the concept

Real-time 3D render · drag to rotate · final design may varySwipe sideways to rotate

1. 01

   The whole RacketOne

   The net posts are the product and their own line and net judge. Each post carries one circuit board of our own up the tube: an RV1126B that makes the calls from two global-shutter camera chips (the line camera on its half and the low kitchen camera), an always-on ESP32-S3 that keeps the score, the keys, the radar and the cord motion between rallies, a 60 GHz radar chip, a mic, the e-paper score, the call lamp and tone, a security chip, and the battery system over four cells in the foot; the home post adds the LTE-M modem to the app.

2. 02Brain

   Our net-post board: the always-on ESP32-S3 in the home post

   The brain: it runs the racketone-court program

3. 03

   Line camera and processor

   OV9281 sees its sideline, service line and T; RV1126B calls them

   RV1126B on the same board · the board's own camera flex · Bounces, verdicts and the clip

4. 04

   Kitchen camera head

   Low OV9281 sees the kitchen and net: faults, short serves, touches

   RV1126B on the same board · camera flex, frame-synced · Foot, serve and net events

5. 05

   Radar, mic, cord motion

   Counts people on court, logs noise, feels lets through the cord

   Our net-post board: the always-on ESP32-S3 in the home post · SPI and PDM on board · People, noise, lets, net touches

6. 06

   Score, keys, lamp, tone

   E-paper score, sealed team keys, the call lamp and tone

   Our net-post board: the always-on ESP32-S3 in the home post · SPI, GPIO, data line, PWM · Score, points, verdicts shown

7. 07

   Security chip and tamper

   Signs every call into an append-only log; logs hatch openings

   Our net-post board: the always-on ESP32-S3 in the home post · I²C and GPIO · Call signatures, tamper events

8. 08

   LTE-M, Wi-Fi, Bluetooth

   Home post sends to the app; the posts talk to each other

   Our net-post board: the always-on ESP32-S3 in the home post · UART and SDIO on board · Signed calls, score, use

9. 09

   Cells and battery system

   Four 18650 cells; charger, protection and gauge; M8 charge socket

   Our net-post board: the always-on ESP32-S3 in the home post · the cell tab's strip pads · Power for a 10-hour day

10. 10

    All connected

    8 key parts, one program, and your phone

Our circuit board · rev A-0

One board of our own inside RacketOne

Every chip on one board we design, shaped to fit: the processor, cameras and sensors, Wi-Fi and Bluetooth, lights, sound and power. No plugs, ribbons or adapters. It is checked in our CAD against every part around it, and it arrives from the maker ready to run our software from a microSD card. Turn the model, or pick a part below to see where it sits.

Demo · 7 real-world moments

See RacketOne work

Short animated scenes of real moments: what happens today, what RacketOne does about it, and what lands on your phone. The same scenes play in the IEMI app.

Demo scenes show how RacketOne and its app are designed to behave. RacketOne is in design; nothing here is recorded from real equipment yet.

The idea

The net posts are the line judge and the net judge: they call lets, lines, kitchen faults and net touches, and keep the score, the noise and the bookings

How the parts connect

RacketOne, wired up

Every part, what links it to the brain, and how the data reaches your phone. A solid line is a cable; a dashed line is a radio link.

The program

What controls RacketOne

for (;;) {
    while (keys_pop(&e)) score_key(&e);                 // SW2/SW3 under the sealed plungers
    if (match_on() && !rv1126b_awake()) rv1126b_wake();
    while (rv_uart_pop(&c) || ble_away_pop(&c)) {       // RV1126B + the away post
        if (c.conf < c.needed) c.call = UNSURE;         // never guess: keep the clip
        atecc_sign(&c); log_append(&c);                 // security chip, append-only
        lamp_show(&c); tone_play(&c); epd_draw(score_apply(&c));
        if (home_post()) lte_mqtt_publish("r1/dev/call", pack(&c));
    }
    if (radar_empty() && booking_started(10)) booking_release();  // 60 GHz radar chip
    if (every_min(15)) noise_publish(mic_levels());
    vTaskDelay(pdMS_TO_TICKS(10));
}

To your phone

How the data reaches RacketOne

Players' phones and the club or park manager's phone; a read-only page for neighbours

1. Home net post
2. LTE-M · MQTT over TLS
3. RacketOne app and the club's booking platform
4. BLE and UART inside the posts
5. Home net post

Key specs

Targets for production units; they may change during development.

Pricing

Target pricing. Bought separately, ScorePost with camera pods ($649), a RallyPair ($129), a LetTap ($79) and 2 BaseClips ($300), plus a PickleQuiet fence unit ($899) with the radar ($149) and a QuietLight ($169), add up to $2,374 + $44/month per court. A plain pair of 3 in internal-wind posts is about $559. Parts cost about $664 per court pair at qty 1, about $1,096 with fabrication, a net winder, assembly and freight (est.).

Indicative launch pricing in USD, excluding taxes and shipping. Final pricing is confirmed before any balance is charged.

1. 3 Nov 2026, 21:50LatestA club or park buyer reading the RacketOne page should see the net posts as they will be sold: one board of our own up each post. Until now the 3D view, the parts list and the wiring still lit the bench parts (a Pi Zero with an AI camera, two XIAO boards, a radar module, an e-paper board and a Walter board), so the page showed a prototype, not the product.

   • What we designed: RacketOne rev T, the net posts with our board inside, done the way CricketOne and AthleticsOne put their boards in. The bench electronics come out of both posts; the folded board goes in: the cell tab over the four cells in the foot, the spine 22 mm in front of the post middle with every chip facing the court-face windows, the kitchen camera head low behind its window, the key tabs folded round to both faces of the net, the RV1126B brain on solid wall, the radio section with the radar chip and every antenna behind the radio window, and the line camera head behind its window on the half's face. The post itself gets the changes the board asked for: a 50 x 60 mm radio window, the tone holes and mic port on the court face, the service hatch on the court face and a screw-locked M8 charge socket. The Wiring and Program sections now name our board: the ESP32-S3 keeps the score, keys, radar and noise between rallies and wakes the RV1126B for match play. See /products/racketone/ and /build/racketone-boards
   • How we checked it: every board part was checked in 3D against the tube, with 0.3 mm clearance, and against the four cells. One real fix came out: the line camera head is turned 60 degrees and tilted 15 degrees, and a corner reached 0.07 mm into the wall, with the lens rim 0.11 mm into the window. The board's own check had only looked along the head's centre line. The head moved 0.8 mm back along its own axis (it still looks through the middle of its window), and the board code now checks every head corner and lens rim in 3D. After that nothing touches and the assembly check finds no problems. All seven boards were re-run: 0 placement problems, every design review 0 fail, KiCad design-rule checks 0, packs rebuilt
   • What we learned: a turned or tilted part has to be checked in the product, in 3D, not only on the flat board. That is now a shared rule for every board (fit3d): each board's design review shows whether it has been checked inside its product, and the ones not yet placed (CellOne, RoomOne, DampOne, ChillOne) show it as still to prove. No new CricketOne board decisions since the last update
   • What is next: the same step for CellOne, then RoomOne and DampOne: board in the product CAD and the Wiring and Program sections on our own board

   See it in 3DFull research and design

2. 3 Nov 2026, 19:25A club, park or HOA buys the smart net posts as one pair per court, so each post must be one board an assembly house makes and tests the same way, with nothing plugged together inside a round 76 mm post that stands outdoors all year and takes ball and body hits.

   • What we designed: one rigid-flex board up each net post. In a round tube a flat board is widest through the middle, but every window is on the court face, so the board stands 22 mm forward, still 52 mm wide. From the bottom: a flat tab on the cells, the battery system with a screw-locked charge socket and the tamper switch, the kitchen camera chip on a head turned 16 degrees to its own half, the call lamp and tone with two small tabs folding round to the team keys, the e-paper panel soldered on by its own tail, the RV1126B brain cooled through a small aluminium block into the post, the radar chip, always-on ESP32-S3 and every radio behind one radio window, and the line camera chip on a head turned 60 degrees and tilted 15 down at its window under the net cord. It replaces the Pi Zero, the AI camera ribbon, two XIAO boards, the radar module, the e-paper board, the PowerBoost, the breakouts and, on the home post, the Walter. See /build/racketone-boards
   • How we checked it: the board is written as code and opened in KiCad (0 design-rule violations). It places 63 parts at their datasheet sizes and checks that each fits its section and stays inside the round post, nothing overlaps, the lamp, tone, mic, charge socket, tamper and e-paper tail sit on their places, both camera axes leave through the middle of their windows with lenses wide enough for the post design's camera checks, the radar and every antenna face the radio window, the processor sits on solid wall, the board stays clear of the net cord, and every flex is long enough. All checks pass. A 3D model shows the board folded in a see-through post or laid flat
   • What we learned: the round post decides the board. A board in the middle would leave the cameras and radar 36 mm behind their windows, looking out through a keyhole, so the spine moves toward the court face and the post design changes in six places: the tone and mic move to the court face, the radar slot grows into one radio window, the hatch and a screw-locked charge socket move to the court face, and the keys become sealed plungers
   • What is next: the key switches, charge socket and e-paper tail from the makers' drawings, whether the RV1126B takes both cameras at 120 frames a second, the radar and radios through the window on a test post, and the next product's board, DampOne

   See it in 3DFull research and design

3. 29 Oct 2026, 18:50USA Pickleball's 2026 rulebook changed how a ball that bounces in and then hits the net post is called, how fast an out call must come, and rally scoring, and spectators must no longer be asked about calls (USA Pickleball 2026 Rulebook Change Document). The ITF's 2026 amendments clarified doubles foot faults and tie-break end errors (ITF).

   • Market and rules check (DESIGN.md): every ITF 2026 and USA Pickleball 2026 change listed with what it changes in RacketOne; the net post rules are unchanged, so the CAD and the legal checks stand
   • Ball on the post: in pickleball the posts now check whether the ball bounced in first; if it did, the hitter wins the rally (rule 10.C.5); if not clearly seen, the point is replayed (equipment.json)
   • Out calls are timed to show on the post before the opponent hits the ball (rule 8.F.3); the score follows 2026 rally scoring and the 7-point weather game, and corrections wait for the end of the rally (6.F)
   • Tennis: the doubles alley is accepted as a legal place to serve from in the foot-fault evidence, and the posts flash a change-ends reminder in tie-breaks (ITF Rules 18 and 27)
   • Competitors: PlayReplay net-post cameras on the PPA Tour and USTA Pro Circuit, Owl AI at Major League Pickleball; all run per event or venue with no public club price, and none is a club product that makes calls with nothing added to the court. Price kept at $1,590 + $29/mo for the pair
   • Product page https://iemilabs.com/products/racketone/ gains a 2026 rules FAQ and a rules line in its specs
   • Next: ask club pickleball players in phase 3 about No official mode under rule 8.J and rally scoring as the default; close-out C9 (recommend the first product to the owner) from 30 Oct 00:00

   See it in 3DFull research and design

4. 28 Oct 2026, 19:10A tennis or pickleball club needs its league nights, ladders and park matches called fairly with no umpire: it already buys net posts (about $559 a pair, court supplier price), players pay $96-300 a year each for phone line-calling apps (App Store), and pro pickleball now uses cameras on the net posts (PlayReplay at PPA and MLP events, 2026).

   • Buyer check with sources: what clubs pay for posts, referees and line-calling apps today, and the three closest products (PlayReplay post-mounted cameras, SwingVision on a phone, PlaySight court cameras)
   • New competitor learned: PlayReplay puts four cameras on the net posts for pro pickleball and plans to reach clubs, reported at about $3,500-4,500 per court a year; it proves the need, and our posts stay the legal equipment themselves at a one-off price
   • Parts list prices checked on maker pages today: $648 of parts per court at qty 1; cost and margin table in the design notes (about 32 % at qty 1 and 54 % at qty 100, est.), price kept at $1,590 + $29 a month
   • Power corrected: the line calls need the camera on for the whole match, so a charge lasts about 13.8 hours of play, not 19; busy courts charge from the lighting column
   • Design data cleaned: the old rev A parts and gate story in the product data now match the rev O posts; a missing net winder was found and costed for the next CAD step
   • Product page: the summary leads with the calls, a new Calls spec group shows what it decides alone and what it only assists, and the first three FAQs answer the buyer's top questions

   See it in 3DFull research and design

5. 28 Oct 2026, 03:15Most tennis and pickleball at clubs and parks has no umpire or line judges, so players argue about lets, lines near the net and kitchen faults. Club buyers pay for phone apps (SwingVision, PB Vision) or court camera systems (PlaySight) that need a phone or a fence camera; the ITF Rules (Rule 1) and the USA Pickleball rulebook (2.C) allow only the net, posts and cord on court.

   • Rev O: each post now has a kitchen camera (Seeed XIAO ESP32-S3 Sense) behind a flush window low on its court face, a call light (NeoPixel Stick 8), a call tone, a tamper switch and a secure element; the AI camera is turned to its half's lines
   • The CAD checks 14 camera views: sidelines, the service line and T, the whole kitchen line, the net and the let ball; the far baseline is evidence only
   • equipment.json: nothing added to the court, 8 calls (7 alone in club play, far baseline and foot faults assist; unsure below a stated confidence), 4 impact cases (90 J serve on the windows, player into the post, cord tension, weather) and every security key
   • App: new 'No official' match mode, line calls and kitchen and net screens; product page, idea plan, BOM and buy list updated; $1,590 per court vs $2,374 + $44/month for our products separately
   • CAD review: 28 Oct 2026, all sizes from datasheets, no floating parts, no collisions

   See it in 3DFull research and design

6. 27 Oct 2026, 23:50A tennis or pickleball club, park or HOA already buys one thing for every court: a pair of net posts. ITF Rule 1 limits posts to 15 cm across with the top no more than 2.5 cm above the cord, and USA Pickleball 2.C.2 limits them to 3 in (https://www.itftennis.com/en/about-us/governance/rules-and-regulations/, https://playpickleball.com/2025-usa-pickleball-rules-section-2-court-and-equipment). The product must be those posts, legal for both sports.

   • Redesigned RacketOne (rev S) as a pair of smart net posts: Ø76.2 mm round posts drawn in code CAD, and the script checks ITF Rule 1 (under 15 cm, top 20 mm above the cord, centres 0.914 m outside the doubles court) and USA Pickleball 2.C.2 (3 in maximum)
   • Inside each post: an AI camera on its half of the court with a Pi Zero 2 W, a radar behind a flush slot, a mic and motion sensor board, an e-paper score and two team keys, and four cells in the sleeve; the court brain with LTE-M sits in the home post
   • Removed the score head above the cord, the solar cap, the base unit, the RallyPads, the fence LineCams, the GateKey and the lights relay; gate and lights now run through the club's own booking-linked lock and lighting controller; far-baseline calls and the spoken score are listed as gaps with the reason
   • CAD review: every bought part sized from its maker page or datasheet, both posts in their sleeves on a dual-lined court with the net, no collisions, no floating parts. Price $1,490 per court vs $2,374 + $44/month for our products separately. Next: DiamondOne as a smart pitching machine or L-screen; see https://iemilabs.com/products/racketone/

   See it in 3DFull research and design

7. 27 Oct 2026, 23:50One tennis and pickleball product per court, as the smart net posts themselves.

   • Still part of RacketOne, now redesigned as smart net posts: https://iemilabs.com/products/racketone/

   See it in 3DFull research and design

8. 27 Oct 2026, 23:50One tennis and pickleball product per court, as the smart net posts themselves.

   • Still part of RacketOne, now redesigned as smart net posts: https://iemilabs.com/products/racketone/

   See it in 3DFull research and design

Smart equipment · legal on the field

RacketOne is the tennis and pickleball net posts (pair): two round aluminium posts, made smart

It replaces a club's or park's existing pair of tennis net posts on a court lined for tennis and pickleball (the same post fits a dedicated pickleball court's sleeves at 22 ft), with every part built in. Everything is inside the two posts: an AI camera, a Pi Zero 2 W, a radar, an e-paper score, two keys, a sensor board with a mic and four 18650 cells in each; the court brain with LTE-M in the home post. Rev O adds a kitchen camera, a call light, a call tone, a tamper switch and a secure element inside each post, still behind flush windows. Same Ø76.2 x 1,090 mm posts in the same sleeves. About 1.7 kg of aluminium per post (from the CAD) plus about 0.45 kg of electronics (est.).