IEMI's one product for baseball and softball: a smart home plate and three smart bases that are their own umpire, calling balls and strikes, force outs and fair or foul, with the count and pitch counts in one app
Software: $29 per field per month
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How it fits together
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01
The whole DiamondOne
The plate and the bases are the product: a Raspberry Pi Zero 2 W brain in the home plate with a camera looking up the strike zone and a front camera and radar facing the pitcher; a camera, a mic and four foot sensors in each base; each call signed inside the item that made it and sent to one app.
02Brain
Raspberry Pi Zero 2 W in the home plate
The brain: it runs the diamondone-umpire program
03
Strike-zone camera in the plate
Looks straight up through the Ø34 window in the middle of the plate and finds where the ball crosses the zone (checked in the CAD for batters 1.50 to 1.87 m)
Raspberry Pi Zero 2 W in the home plate · CSI-2 ribbon to the Pi Zero 2 W · Ball position each frame from the on-sensor model; a 10 s clip on close calls
04
Front camera in the plate
Faces the pitcher 30 degrees up from the plate's front edge: the last 2 m of every pitch and the first 1.5 m of every ball off the bat
Raspberry Pi Zero 2 W in the home plate · UART (GPIO 14/15) and 5 V inside the plate · Ball track points and the pitch arrival time
05
Pitch and ball radar in the plate
Under the flush radome at the front edge: the speed of every pitch, every ball off the bat, and the pitch count
Raspberry Pi Zero 2 W in the home plate · USB serial · Speed and direction, 20 readings a second
06
Camera and mic in each base
Behind the window towards home (first, third) or first (second), tilted 20 degrees up: the glove taking the throw, the runner's foot, the ball passing the bag on the line; the mic hears the glove pop
Raspberry Pi Zero 2 W in the home plate · BLE LE Secure Connections to the plate (18 to 26 m) · Signed calls (safe, out, foul, unsure) with times; a clip on request
07
Foot sensors under each base cover
Four force sensors under the cover give the exact moment a foot touches the bag
Raspberry Pi Zero 2 W in the home plate · Analog inputs on the base's XIAO ESP32-S3 · Touch start and end times, 1 ms resolution
08
Secure element, call light and tone in every item
Signs each call with its clip; the NeoPixel light and piezo tone show it on the plate or the base
Raspberry Pi Zero 2 W in the home plate · I2C (secure element), one data line (light), one PWM pin (tone) · Signature per call; light colour and tone
09
All connected
7 key parts, one program, and your phone
Our circuit board · rev A-0
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.
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Every board-level number DiamondOne's jobs depend on, checked against its target: camera pixels and frame rate, power and battery life, heat where it works, shock, radio and software. Every lesson from every one of our boards is a rule here, so this review runs again whenever any board teaches us something. Boards are ordered only when nothing fails and the items to prove are measured.
| Area | Check | Our board | Target | Status |
|---|---|---|---|---|
| Camera | Zone camera: the ball (74 mm) at the top of a tall batter's zone at 1 m | 75.3 px | ≥ 20 px | passes |
| Camera | Zone camera: smear at 151 km/h, 0.3 ms exposure | 12.6 mm | ≤ 1/3 of the ball (25 mm) | passes |
| Camera | Zone camera: frame rate the calls need | 120 fps at 1280 × 800 | chip: 120 fps at 1280 × 800, 180 fps at 640 × 400 | passes |
| Camera | Zone camera: data rate vs its 2-lane link | 1.23 Gbps (10-bit) | ≤ 80 % of 1.6 Gbps | passes |
| Camera | Front camera: the ball (74 mm) 2 m in front of the plate at 2.2 m | 41.1 px | ≥ 15 px | passes |
| Camera | Front camera: smear at 158 km/h, 0.25 ms exposure | 11 mm | ≤ 1/3 of the ball (25 mm) | passes |
| Camera | Front camera: frame rate the calls need | 120 fps at 1280 × 800 | chip: 120 fps at 1280 × 800, 180 fps at 640 × 400 | passes |
| Camera | Front camera: data rate vs its 2-lane link | 1.23 Gbps (10-bit) | ≤ 80 % of 1.6 Gbps | passes |
| Camera | Base camera (each base): the ball (74 mm) on the line 2 m before the bag at 2 m | 17 px | ≥ 10 px | passes |
| Camera | Base camera (each base): smear at 108 km/h, 0.5 ms exposure | 15 mm | ≤ 1/3 of the ball (25 mm) | passes |
| Camera | Base camera (each base): frame rate the calls need | 30 fps at 800 × 600 | chip: 30 fps at 800 × 600, 15 fps at 1600 × 1200 | passes |
| Camera | Base camera (each base): data rate vs its 1-lane link | 0.12 Gbps (8-bit) | ≤ 80 % of 0.192 Gbps | passes |
| Camera | Image processor load, all cameras | 260 Mpx/s | ≤ 360 Mpx/s (RV1126B ISP) | passes |
| Camera | Cameras in step for timed calls | one frame-sync line from the RV1126B to both OV9281 chips; each base time-stamps its frames and foot touches to the plate's clock over BLE | plate cameras in step; bases within 2 ms of the plate (est.) | passes |
| Camera | AI engine time per frame | 3 TOPS | ball finder on both cameras inside the 8.3 ms frame at 120 fps | to prove on the dev kit |
| Battery | Run time, 4 cells, worst case (aged to 80 %, 5 °C) | 12.4 h | ≥ 10 h | passes |
| Battery | Run time, 4 cells, new, 20 °C | 17.6 h | ≥ 10 h | passes |
| Battery | Spare run time, worst case | 24 % over 10 h | ≥ 20 % (the draw is an estimate until rev A) | passes |
| Battery | Charge time | 10.3 h from flat at 1.5 A; 9 h overnight puts back 100 % of a day | a full day back overnight (9 h) | passes |
| Battery | Peak current from the cells | 2.52 A at 2.65 V | ≤ 32 A (4 × 8 A) | passes |
| Battery | Each pack has its own protector | 2 protectors (U4, U24) for 2 chargers | short, over-current and over-discharge cut-off on every pack | passes |
| Battery | Charging held outside the cells' temperature range | thermistor on the pack, read by the charger | 0–45 °C | passes |
| Heat | RV1126B temperature, full sun, 35 °C air | 49 °C | ≤ 85 °C (rated) | passes |
| Heat | Cell temperature, full sun, 35 °C air | 45 °C | ≤ 60 °C | passes |
| Shock | Clocks rated for the shock | MEMS oscillators | every clock rated for 1000 g | fixed by the review |
| Shock | Ball-grid chips | underfill under U1, U10, U5, U8 | no cracked joints after the drop and hit tests | to prove on the dev kit |
| Software | Starts our software from the microSD card, no setup | microSD socket with a hinged, latched lid (Amphenol 101-00660 class), fitted on every board: our software starts from the card; microSD socket with a hinged, latched lid (Amphenol 101-00660 class): our software starts from the card | card socket fitted on every board, latched | fixed by the review |
| Software | Card power switch and protection | 2 power switches and 2 ESD arrays for 2 card sockets | every socket: switched card supply, ESD on all 6 lines | fixed by the review |
| Software | The card wins the start | eMMC shipped empty; our loader reads the card first | the processor starts from the card every time | fixed by the review |
| Software | Card grade | industrial pSLC microSD (Kingston Industrial or Swissbit S-56u), −40 to 85 °C | rated for the heat, cold and writes | to prove on the dev kit |
| Software | Clip buffer for an unsure call | 6.7 s of 8-bit 120 fps video in 40 % of the 2 GB memory | ≥ 3 s | passes |
| Radio | Wi-Fi/BT module clock | 37.4 MHz MEMS oscillator (Y2) | 37.4 MHz next to the AP6256, MEMS (shock) | passes |
| Radio | Wi-Fi and BLE from the plate | chip antenna under the radome well, the only gap in the cast aluminium tub | certified AP6256 module; phone in the dugout at 20 m, bases at 18 to 26 m | to prove on the dev kit |
| Radio | BLE from each base | ESP32-S3 module antenna at the board edge, under foam and a plastic tray | to the plate at 18 to 26 m (27.4 m at full size) | passes |
| Moisture | Conformal coating | coated | coated, sensors, sockets and antennas masked | passes |
| Fit | Board inside the product CAD, every part checked in 3D | not yet in the product CAD | nothing touches | to prove on the dev kit |
| Camera | Every plate call in its sensor's view | zone camera worst 0° up or down; front camera worst 10.8°; radar worst 12.3° | inside each field of view, and every ray over the plate's front edge | passes |
| Fit | Radome and front window run out to the front bevel | both wells lengthened to the plate's front edge under a flush clear PC skin | the rays to the pitcher clear the top; the skin takes spikes and a 150 km/h ball | to prove on the dev kit |
| Radar | Pitch speed from the plate | the 60 GHz chip reads the ball from about 2.5 m in (knee high) and the ball off the bat | pitch speed within 1 km/h of a reference gun | to prove on the dev kit |
| Camera | Base camera through its Ø12 window | the 6 mm wall leaves ±43.6° round the lens; the lens wants ±50° across | no vignetting over the calls | to prove on the dev kit |
| Battery | Base run time, 2 cells, worst case | 25.7 h | ≥ 10 h | passes |
| Fit | Heat boss and tamper posts | a 39 mm cast boss under the processor; a 31.9 mm post on the plate top's underside; a post under each base lid | added in the rev T CAD and checked in 3D | to prove on the dev kit |
Before we order the first boards, we prove these on the RV1126B development kit or in the rev A tests:
Demo · 7 real-world moments
Short animated scenes of real moments: what happens today, what DiamondOne does about it, and what lands on your phone. The same scenes play in the IEMI app.
A 12U rec game with no umpire booked. The coaches pick No official on the scorer's phone and play ball.
Use cases
A parent volunteer stands behind the mound and calls everything, and both dugouts shout at every close play.
The plate calls balls and strikes and the bases call force outs. A play at first is too close to call alone (foot and glove 20 ms apart), so first base lights blue and the clip goes to both coaches, who agree: safe.
A volunteer umpire behind the mound guesses at the edge of the plate, and the zone changes every inning.
The plate's zone camera looks straight up while the front camera and radar track the last 2 m. The zone is set from the batter's height (27 to 53.5 %); the ball crosses 1.4 cm inside it at mid-plate. Plate light green: strike.
From behind the plate the umpire has to see the foot and hear the glove 60 ft away, at the same instant.
Four force sensors under the cover time the runner's foot; the base camera sees the glove and the mic hears the ball pop into it. Ball in the glove 40 ms before the foot: first base lights red.
Nobody stands on the line, so the dugout nearest to it decides, and the other one never agrees.
The third base camera looks back along the line towards home and sees the ball pass the bag just outside the line: foul. Third base lights amber with a tone.
The coaches yell from dugouts 40 m away; nobody saw the hand and the glove at the same moment.
A tag stays a person's call. Second base's force sensors time the hand on the bag and its camera sees the glove come down; the clip and the timing go to both coaches' phones as evidence, with no light.
A parent keeps a tally on paper, loses count between innings, and nobody knows the rest days until later.
The plate radar and front camera count every pitch that reaches the plate area and check the total against the published youth guideline for the pitcher's age.
The dial says 60, but the wheels wear and nobody measures, so hitters train against the wrong speed for weeks.
The same plate, set in a cage lane, measures every pitch at the plate with its radar and zone camera: 57.8 mph on average against 60 set, 14 of 20 in the zone.
Demo scenes show how DiamondOne and its app are designed to behave. DiamondOne is in design; nothing here is recorded from real equipment yet.
What it is
IEMI's one baseball and softball product: a smart home plate and three smart bases that make the calls, in one app.
What it does
Who it's for
Youth, rec, school and club leagues short of umpires, and batting-cage facilities.
The idea
The problem today
Youth and rec baseball runs short of umpires: leagues pay $35 to $85 a game, games start late or a parent calls balls and strikes, and arguments end with no evidence. Pitch counts are kept on paper. In the cage, hitters want pitch speed and location. Every fix today is another camera on the fence or another person.
With DiamondOne
The league swaps its plate and bases for a DiamondOne set of the same size on the same anchors. The plate calls balls and strikes from below, the bases call force outs and fair or foul, every call lights up on the item with a tone, and the count, score and pitch counts reach the scorer's phone. When it is unsure it says so and keeps the clip.
How the parts connect
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
while game.open:
p = radar.read() # OPS243: speed and direction
if p.from_pitcher:
pitch = game.pitch(p.mph) # count for this pitcher
x = zone.cross(zonecam.track(), front.track())
call = zone.call(x, batter.height) if x.conf > 0.9 else 'unsure'
game.apply(sign(call, clip(p.t))) # ATECC608 in the plate
light.show(call); tone.play(call)
for c in bases.calls(): # signed by each base
game.apply(c)
app.send(game.state())To your phone
The scorer's and coaches' phones, parents' phones, the umpire's phone when there is one, and the cage facility desk
One screen for each job DiamondOne does.
No official game modeA 12U rec game with no umpire booked: the coaches pick "No official" on the scorer's phone and play ball.
Balls and strikesA 2-1 pitch just catches the outside edge for an 11-year-old batter, 1.52 m tall.
Plays at the basesA ground ball to short, the throw to first and the runner arrive almost together.
Pitch countsThe starting pitcher, age 12, is deep into the 4th inning.
Cage laneLane 3's machine is set to 60 mph; a 15-year-old checks in with the booking code.
App screens with sample data. The interface is in development.
| Calls | Strike, outside edge, signed 18:42:07 | Each pitch and play |
|---|---|---|
| Count and score | 2-1, 1 out, top 3rd, 4-2 | Each call |
| Pitch counts | Pitcher #12: 61 pitches, 3 rest days (ages 11-12) | Each pitch |
| Pitch speed and location | 52 mph, low and away | Each pitch |
| Clips | Force out at first, 40 ms, 10 s clip | Close calls and unsure |
Clips stay in the set and the league's app space; only 10 s around close calls, deleted after 7 days unless a coach saves one. Junior play needs the league's consent screen. No faces are recognised.
CAD design · Design rev O, 28 Oct 2026: smart home plate and three bases (OBR 2.02 and 2.03 sizes, plate flush, checked in the CAD), its own umpire; not built
| AI processor | One board of our own in the home plate: Rockchip RV1126B (3 TOPS) on the plate board, the only brain; one board of our own in each base with an ESP32-S3 module that makes that base's calls. The bench set uses a Raspberry Pi Zero 2 W and Seeed XIAO ESP32-S3 Sense boards until the boards arrive |
|---|---|
| Camera | OmniVision OV9281 global-shutter chip on a head up in the plate's middle window, looking straight up the zone at 120 fps; a second OV9281 on a tab at the plate's front edge looking 30° up at the pitcher; an OV2640 chip with a wide lens in each base |
| Sensors | TI IWR6843AOP 60 GHz radar chip on a tab under the plate's front radome: the speed of every pitch and every ball off the bat · 4 force sensors under each base cover, their tails soldered to the base board: foot on the bag · MEMS mic on each base board: the ball popping into the glove · Call light and sounder in every item, a security chip and a tamper switch on every board |
| Connectivity | BLE Secure Connections from the bases to the plate · Wi-Fi with TLS from the plate to the app · Every call signed by an ATECC608 in the item |
| Power | 4 x 18650 soldered under the plate board with their own charger: about 12 h of a 10-hour tournament day counted with cells aged to 80 % and cold (3.0 W in play, est.); 2 x 18650 on each base board, about 26 h (est.); one latched lead to a sealed charge socket in each item; charge between game days |
| Enclosure | Plate: cast aluminium tub with a moulded whitened rubber top and flush windows. Bases: rubber-covered shell, foam over a sealed tray, the usual anchor stem |
| Dimensions | Plate 17 in (431.8 mm) five-sided, 120 mm deep, flush; bases 15 in (381 mm) square, 100 mm thick; plate about 8.9 kg, bases about 3.3 kg each (est.) |
| Balls and strikes | alone, about ±2 cm at the edge (est.) |
|---|---|
| Force outs | alone, plays over 50 ms apart |
| Fair or foul | alone at first and third |
| Tags | assists (clip) |
| Sizes | OBR 2.02 and 2.03; NFHS 2027 double first base or 18 in first base |
|---|---|
| Added to the field | Nothing |
| Detachable parts | None |
| Pitch speed | ±1 mph (est.) |
| Run time | plate about 12 h of games, bases about 36 h (est.) |
Targets for production units; they may change during development.
Hardware: $1,990 per set (home plate and three bases)
Software: $29 per field per month
Target pricing. A plain set today: Hollywood Impact bases $399.95 to $499.95 plus an in-ground plate from $79.95, and umpires at $15 to $85 each a game. Bought as our separate products: CageTrax $2,490 + CageGuard $249 + LengthLock Kit $449 + CoachVision bay $990 = $4,178 + $138/month. Parts $1,018 a set at qty 1; built cost about $1,430 at qty 1 and $1,000 at qty 100 (est.).
Indicative launch pricing in USD, excluding taxes and shipping. Final pricing is confirmed before any balance is charged.
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From the product lab · ideation phase
Smart equipment · legal on the field
It replaces the home plate and the three bases a youth league, school or club field already uses (an in-ground home plate and anchored bases, about $350 to $600 a set, est.), plus the plate in each batting-cage lane, with every part built in. Everything is inside the plate and the bags: the brain, two cameras, a radar, a call light, a tone, a secure element, a tamper switch and 4 cells in the plate tub; a camera with a mic, four foot sensors, a call light, a tone, a secure element, a tamper switch and 2 cells in each base tray. Same sizes and the same ground anchors as a plain set. Plate about 8.9 kg + 0.35 kg of electronics, each base about 3.3 kg + 0.2 kg (est., from the CAD).
| Rule | Limit | DiamondOne |
|---|---|---|
| OBR 2.02: home base a five-sided slab of whitened rubber, 17 in square with two corners removed: 17 in front edge, 8.5 in sides, 12 in back edges | 17 in / 8.5 in / 12 in | ✓ 431.8 front, 215.9 sides, 305.3 back edges (the rule's own geometry gives 12.02 in), checked in the CAD; whitened rubber top |
| OBR 2.02: home base set flush with the ground, top edges beveled | flush, beveled | ✓ top at ground level and nothing above it (checked in the CAD); 6 mm bevel on every top edge; every window is flush in the rubber |
| OBR 2.03: bases 15 in square, not less than 3 nor more than 5 in thick, filled with soft material | 381 mm square, 76.2 to 127 mm thick, soft | ✓ 381 mm square and 100 mm thick, checked in the CAD (https://umpirebible.com/OBR16/2.0.htm); closed-cell foam over a sealed 30 mm tray; MLB's 18 in cover fits the same tray |
| OBR 2.03: bags securely attached; first and third entirely inside the infield, second centred on its point | anchored, placed by the rule | ✓ the usual Ø38 stem in the field's own ground anchors; positions checked in the assembly (60 ft paths) |
| NFHS 1-2-9 (high school, in force 1 Jan 2027; states may start in 2026): a double first base, a white half in fair ground and a contrasting coloured half in foul ground, touching; balls that hit the white half are fair, the coloured half foul. July 2026: an 18 in first base is allowed instead | white 15 in + coloured 15 in, no gap (or one 18 in base) | ✓ double first base option: the same tray 762 x 381 x 100 mm, electronics in the white half, four more force sensors under the coloured half, stems under both halves, checked in the CAD (16/16 items fit); or the 18 in cover on the standard tray |
| NFHS 1-6-3 (2026): players may not wear devices that record or transmit audio or video | nothing worn by a player records | ✓ nothing is worn: the cameras and mics are inside the plate and bases, which are field equipment; there is no detachable part |
| Nothing added to the field: only the plate, the bases and the pitcher's plate are game items (OBR 2.01 to 2.04) | no extra objects | ✓ every camera, radar and sensor sits inside the plate or a base behind flush windows; no masts, tripods or fence cameras |
| Electrical: no mains on the field | extra-low voltage only | ✓ Li-ion cells inside each item; a cage lane's plate takes 5 V from a buried USB-C lead to the lane outlet |
Youth league, school, club, adult rec and training play, and batting-cage lanes. In sanctioned games (NFHS, NCAA, pro, tournaments with their own umpires) it only assists: calls go to the umpire's and the scorer's phone as evidence and never replace the umpire. MLB's ABS challenge system (2026) uses 12 Hawk-Eye stadium cameras; we do not claim to match it.
One piece of equipment does
Not done by the equipment, and why
Makes the call itself
With no umpire (youth practice games, rec leagues short of umpires, school PE, training), the set calls balls and strikes, force outs and fair or foul at first and third, and keeps the count, outs and innings. The call shows on the item: the plate light green for a strike, white for a ball; a base light green for safe, red for out, amber for foul; a short tone from inside it. Unsure means blue light, two short tones and the clip goes to both coaches' phones: the coaches agree the call, as in an unofficiated game. Tags, check swings and outfield plays stay the coaches' call, with the clips as evidence.
| Call | Who decides | How it sees it | How players see the call · if unsure |
|---|---|---|---|
| Ball or strike: the pitch passes through the zone (the ABS flat zone at mid-plate, 27 to 53.5 % of the batter's height from the roster)< 0.5 s · about ± 2 cm at the zone edge (est.) | The equipment | plate zone camera (straight up), front camera and radar (the last 2 m of the pitch); ball detector on the IMX500, crossing point from the zone camera with depth from the ball's known size, fused with the front camera track; batter height from the roster | Plate light green (strike) or white (ball) with one tone; the count on the scorer's phone. Ball hidden by dirt on the window, or within 2 cm of the edge under 90 %: unsure, the coaches or the umpire call it |
| Force out or safe at first, second or third base: foot on the bag before or after the ball is in the glove (with a double first base: the fielder on the white half, the batter-runner on the coloured half, NFHS 8-2-2)< 1 s · about 95 % on plays more than 50 ms apart (est.) | The equipment | four force sensors under the cover (foot touch time; a double first base has four more under the coloured half, so it knows which half each foot touched), base camera (glove and runner), base mic (the ball popping into the glove); foot-touch time from the sensors against the catch time from the glove pop and the camera; which foot is the fielder's from the camera | Base light green (safe) or red (out) and a tone from that base. Under 50 ms apart or under 90 %: unsure, the clip goes to the umpire or the coaches |
| Fair or foul at first and third base (with a double first base: a ball that hits the white half is fair, the coloured half foul, NFHS 1-2-9)< 1 s · about 95 % within 5 cm of the line (est.) | The equipment | first and third base cameras, looking back along the line towards home; ball detector + where the ball passes the bag against the line | Base light amber and one tone for foul; none for fair. Ball hidden by a fielder or under 90 %: unsure |
| Tag on a runner at a base (steals, pick-offs)< 2 s · about 85 % (est.) | Helps the official | base camera, force sensors; glove-to-runner contact against the foot-on-bag time | Clip to the phones, 'EVIDENCE' in the app, no light. Always the umpire's or coaches' call; the clip is evidence |
| Pitch speed and pitch countinstant · speed ± 1 mph (est.); count 100 % of pitches that reach the plate area | The equipment | plate radar and front camera; Doppler speed over the last metres; a pitch counted when a ball arrives from the pitcher | Count on the scorer's phone and the app; a warning at the guideline limit. Pick-off throws and pitches short of the radar are added on the scorer's phone with one tap |
| Count, outs, innings and the scoreinstant · 100 % of what is called or entered | The equipment | the calls above, and the scorer's taps for hits, runs and outs away from the bases; baseball and softball scoring rules | The plate light flashes for strike three or ball four; the score in the app. The scorer can undo the last call with a reason, kept in the signed log |
| Double first base: which half the batter-runner and the fielder touched on the first play at first (NFHS 8-2-2)< 1 s · about 95 % on which half (est.) | Helps the official | force sensors under the white and the coloured halves, base camera; touch times per half against the catch time; the camera follows the runner in to 1 m (the last 0.6 m is outside its view, checked in the CAD) | Clip and "white or coloured half" to the phones, no light. The ruling on a runner who touched only the white half (or a fielder drawn into foul ground) stays the umpire's or the coaches'; the base shows the evidence only |
Nothing added to the field
The only things in play are the items the laws already put there:
No cameras on the backstop, fence or dugouts, no tripods and no umpire wearable. Phones stay in the dugout and no call depends on them.
Built to take the hits
Secure by design
In club, rec, school and training games, yes: it calls balls and strikes, force outs, fair or foul at first and third, the count and the pitch count by itself. Tags, check swings, hit by pitch, balks and outfield plays stay with the coaches, and any close call it is unsure of goes to the coaches with a clip.
The target is $1,990 a set plus $29 a month per field. A plain plate and bases cost about $480 to $580, and one umpire is $15 to $85 a game, so one plate umpire for a 40-game season costs a field about $600 to $3,400. It also replaces CageLane, CageTrax with CageGuard, and CoachVision Bay ($4,178 + $138/month bought separately).
Yes, as an assistant. The plate and bases keep the Official Baseball Rules sizes (2.02 and 2.03), so they are legal equipment, but the calls only count where the league or governing body approves them. Elsewhere each call and its clip go to the umpire, whose call stands.
It says unsure with a blue light and two tones, keeps a clip and leaves the call to the umpire or the coaches. It never guesses.
Check swings, hit by pitch, balks, outfield catches and home runs, and fair or foul on balls rolling right in front of the plate. Nothing may stand on the field to see them, so the umpire or the coaches call them.
The plate does: pitch speed, location and machine drift. Swing distance, launch angle and front-on replay need a view from in front, so they are estimates only.
Yes. From 1 January 2027 high school fields use a double first base (white half in fair ground, coloured half in foul ground) or, since July 2026, an 18 inch first base. DiamondOne comes with either: the double base has foot sensors under both halves, so it calls force outs and fair or foul on the right half and shows which half the runner touched. The ruling on a wrong half stays with the umpire.
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Concept · target $1,990