Scroll to take it apart
Every part, every file.
51 boards, no two alike. Trapezoids and triangles cut to the head, a printed shell, five cameras, and a knit beanie over all of it.
1,434dry gold contacts, no gel
93.2%of the scalp under a board
51contact boards, every one a different shape
5cameras: three front, two on the back rim
35 hto print the shell
1,434 contacts. All of them gold.
Seen from the scalp: one off-the-shelf pogo pin on every contact. Each board is small enough that 3 mm of spring reaches the scalp from all of its pins.
Real boards, real parts.
A pogo pin reflowed on every contact, a buffer behind it, an ADS131M08 for every eight, an RP2040 controller stacked 1.5 mm behind on four DF40 pairs.
The hub.
Sixteen cable ports, two RP2350s, an ESP32-S3 for Wi-Fi, USB 2.0 through an FT2232H, and a 4000 mAh cell under the pod cover.
Five cameras.
Three across the front, two on the slanted back rim, each lens through a grommet in the knit with a microphone beside it.
Everything to build one.
Bill of materialsEvery part, counted from the design
Plans and files3D parts, board files, the pin to buy
Design notesHow and why it is built this way
Where it stands
| part | what it is | state | |
|---|---|---|---|
| Layout | 51 boards cut to the head, 1,434 contacts, 93.2% of the scalp | every contact inside one pogo pin's stroke; clearances checked in 3D | done |
| Contact boards | pogo pad, buffer, divider and coupling cap per contact; an ADS131M08 per eight | circuit and per-board placement; routing next | routing |
| Controllers | RP2040, flash, crystal, LDO, FPC to the hub, stacked on four DF40 pairs | circuit done; outlines follow the main boards | routing |
| Pogo pins | 16 mm SMD pogo pin, spherical gold-plated tip, 3.0 mm working stroke (3.5 mm full), about 120 g | off the shelf | buy |
| Hub EXO-430 | reference and bias, clock, 16 controller ports, battery, USB-C and Wi-Fi | circuit and BOM; layout next | in design |
| Shell EXO-140…144 | PETG on an Ender-3 V3 SE, split crown and bands, hub pod | 34/34 checks pass; standoffs and slots for the 51 boards next | in design |
| Beanie and cameras | rib knit with a turned-up cuff; five cameras and mics in the cuff; USB-C eyelet | modelled; camera board next | in design |