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 materialsAbout $1,600–1,900 for a two-tile bench order
Plans and files3D parts, board files, the pin to buy
Design notesHow and why it is built this way
Where it stands
The v1 boards in the order files are the routed squares; the shapes above are the v2 layout study. Nothing has been built yet.
| part | what it is | state | |
|---|---|---|---|
| Contact boards | a pogo pad, buffer and divider behind every contact, an ADS131M08 per eight, optical sensors | re-laid out for one pogo pin: smaller boards, the gap under each within 2.6 mm. Not routed yet; the routed 44 mm square EXO-410 (nut pads, six pin lengths) is superseded | re-layout |
| EXO-420 controller board | RP2040, flash, crystal, LDO, FPC to the hub. 6-layer, 1.0 mm | routed for the 44 mm square tile (131 traces, 0 DRC errors); needs the smaller outlines | re-outline |
| Shell EXO-140…144 | PETG on an Ender-3 V3 SE | 34/34 design checks pass | printable |
| Pogo pins | one off-the-shelf part on every contact: 16 mm SMD pogo pin, spherical gold-plated tip, 3.0 mm working stroke (3.5 mm full), about 120 g | buy, then reflow with the boards | off the shelf |
| Hub EXO-430 | reference and bias, clock, 16 tile ports, battery, USB-C and Wi-Fi | circuit and BOM; no layout yet | in design |
| Camera ring | five cameras and microphones: three across the front, two on the back rim | concept only | planned |