Camera mount
The foot clips onto the board with three magnets; the arm holds the camera 38.5 cm from the bull, tilted at it. Prints on its side with no supports. The USB lead presses into a channel down the back of the arm.
Throw darts.
Your webcam
keeps score.
Point a webcam at a steel-tip board. Orbis Darts spots every dart, scores it, calls it out and runs the game, all inside your browser.
No install, no account, nothing uploaded. For the best scoring, print the three-camera rig: every file is free.
Try it: throw at the board
501 · Double outTap the board to throw
YouYour aim wobbles, like the real thing
Avg0.0
501
You
Needs 501 · Dart 1 of 3
Turn0
Build the rig
One webcam works. Three, placed round the board, score far better: each sees the dart from its own side and Orbis crosses their views. This is the rig Orbis Darts is developed on: three USB cameras on printed arms, with a ring light designed to sit behind them. Every file is here to print your own.
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Three cameras, 120° apart
At 12, 4 and 8 o'clock, never facing each other. The camera at 12 sits right over the 20, where most darts go.
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Clipped to the board
Each mount's magnets grip the metal band round the board's edge, and a lip over the playing face sets them all at the same height.
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Light from behind the cameras
A ring of LED strip lights the board evenly from every side, under a visor, so no camera ever looks into it.
What you need
Cameras
- ×3
USB camera module
OV9732, 1280×720, 100° lens without fisheye distortion, on a 38 mm square board.
- ×9
Magnets
10 × 3 mm neodymium discs, glued three to a mount's foot.
- ×12
M2 self-tapping screws
Four hold each camera board in its box.
- ×1
A board with a metal band
A bristle board whose metal edge band stands proud of the surround, for the magnets to grip.
- ×3
USB ports
On one computer running Chrome or Edge. A powered hub if you're short.
Ring light
- 3 m
COB LED strip
8 mm wide, 24 V, neutral white 4000 K, CRI 90 or better, 10 W per metre or more. The ring takes about 2.8 m.
- ×1
24 V power supply
2 A or more, with a plain on/off switch. Skip dimmers: most of them flicker on camera.
- ×45
M3 screws
36 × M3×8 for the keys; 6 × M3×12 and 3 × M3×10 for the brackets.
Print files
Ring light Not test-printed yet
Eighteen 20° sections, joined by keys, held behind the cameras by a bracket on each arm. Print one bracket and two sections first and check the fit. Sections print upside down; 2 walls and 10–15% infill keep it light for the arms.
Download everything.zip · 135 KB
Every part fits a 220 × 220 mm bed. The files are licensed CC BY-NC-SA 4.0: print them, change them and share them with credit to Orbis Darts, but don't sell them.
Set up once, then just throw
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Point a webcam at the board
A laptop camera will do. A USB webcam off to one side does better, and with up to three cameras Orbis combines their views to place each dart.
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Let it find the board
Calibrate reads the board's red and green rings and lays a grid over the wires. If the lighting beats it, click four points on the double ring instead.
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Throw
Each dart is spotted, scored and called. Pull your darts and the next turn starts. It will misread one now and then: press Fix last and tap where it really landed.
Tonight's games
- 501
X01
301, 501 or 701. Double out or straight out, a single leg or first to a set number of legs. On a finish, the checkout route appears.
- 15–20
Cricket
Close 15 to 20 and the bull, score on what you own. Marks and MPR for every player.
- 1–10
Against the bot
Ten levels, from a three-dart average of about 22 up to about 106. It throws its visit straight away, then it's back to you.
- 27
Bob's 27
Doubles practice. Start on 27; hits on each double add to it, a visit that misses takes it off.
- 1–20
Round the clock
1 to 20, then the bull, in order.
- Keypad
No camera?
Score on the keypad instead, or use the phone scorer and type each visit's total.
- The caller
- A recorded caller announces every visit, every bust and the game shot, and can call each player's name.
- Players and stats
- Up to six players. Each keeps a 3-dart average, MPR and a heatmap of where their darts land.
- Built to read from the oche
- Big score plates and a TV-style lower third, so the room can follow the game from 3 metres.
The video never leaves your device.
Every frame is processed in your browser, on your laptop. Nothing is streamed or uploaded.
No account. Players, stats and settings are saved in this browser, and the app keeps working offline once it has loaded.
The one thing ever sent anywhere is a player's name, and only if you want the caller to say it.
Game on.
You'll need a webcam, a steel-tip board and a modern browser. Allow the camera when it asks.
Play now