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4 layers155 × 150 mmController carrier, the printed circuit board in 3D

A digital spinal cord-computer interface concept: research, eight KiCad boards, nRF5340 firmware and FreeCAD assemblies.

Size
155 × 150 mm
Copper layers
4
Thickness
1.6 mm
Parts
72
Nets
91
Pads
332
Tracks, vias
1,958, 224
Routed
Yes
KiCad
KiCad 10.0 (file 20260206)
Created
7 Oct 2026
Updated
29 Oct 2026

Overview

Controller carrier is an open-source printed circuit board by pratham-cloud-ctrl, from the pratham-cloud-ctrl/Project-SCCI-RH repository on GitHub. It is a 4-layer board of 155 × 150 mm with 72 parts on 91 nets, routed with 1,958 tracks and 224 vias.

Its parts include 42 resistors, 14 connectors, 7 capacitors and 5 ICs. It belongs with the interfaces and adapters boards and the nRF52 and nRF5x boards of this library.

README

README.md

Project SCCI RH

A spinal interface concept, from scientific question to inspectable engineering

An entirely digital research and engineering project exploring invasive spinal cord–computer interfaces (SCCI): record relevant activity, interpret it, select an individualized intervention, and observe the response.

Two ambitions: expert-informed practice that could improve retained motor learning, and feedback over a selected physiological function.

Inspect the build in your browser · Explore the project · Read the paper · Download the engineering release

No CAD software needed to inspect: the browser inspector provides selectable 3D assemblies, all eight populated boards, interactive component/net lookup, all four copper layers and 80 searchable schematic sheets. The download panel also supplies standard STEP solids, complete FreeCAD files and complete KiCad projects for local inspection and editing.

Future implanted-interface conceptFull-scale engineering reference
Future can, header and separate recording/stimulation leadsEight populated boards in the complete reference chassis
60 × 58 × 14 mm, before leads. A proposed miniaturized package.600 × 310 × 240 mm, including feet. Actual board geometry at 1:1 scale.

Choose what you want to explore

Open the guideWhat you can inspect
01 · Theory & mechanismsUnderstand the ideaBoth application mechanisms, the assumptions behind them, evidence and mathematical models
02 · CAD & 3D modelsExplore the mechanical designAssembled/exploded views, rotatable meshes, editable FreeCAD files, STEP exports and drawings
03 · Electronics & KiCadBrowse the eight boardsBoard gallery, circuit roles, schematic PDF, native projects, layouts and component lists
04 · Firmware & softwareFollow the implemented logicCurrent nRF5340 image, production control code, packet handling and runnable verification
05 · Evidence & reproductionReview the workA short reviewer walkthrough, results, requirements, source records and reproduction commands

Use the browser inspector for viewing. Links labelled native source lead to engineering files that GitHub may offer only as downloads. Use the complete packages in the inspector to open them locally; the guides explain the required software, dependencies and how to preserve the released originals.

The project in one loop

Observe → interpret → calibrate → request stimulation → supervise delivery → observe response.

For motor learning, expert performance informs a task-conditioned reference; learner-specific calibration determines a reachable intervention during practice. Later stimulation-OFF probes assess retention separately from assisted performance. Expert voltage is not replayed as a skill.

For physiological feedback, a function-specific configuration observes a selected state and requests bounded support. The worked pressure example uses an external pressure sensor and positive spinal pressor authority. It is a selected pathway, not a universal body-control mechanism.

What has been delivered

The integrated replay passes 114,426 finite software assertions and includes 5,184 modeled motor events and 1,200 pressure events. Favorable, neutral and adverse learning assumptions are retained. These are software/model results; their implications are explained in the theory guide.

This is a completed digital concept and engineering reference. No physical device execution or original human/animal experiment is claimed. Useful chronic spinal decoding, retained human benefit and a miniaturized implanted implementation remain conditional. The current target records in OBSERVE, inhibits neural acquisition while armed, and has no radio image. The reference boards do not fit the future can.

Start, inspect, or contribute

Pratham Varma conceived and steered Project SCCI RH. AstroSam’s Mind-Link inspired the progression from future vision to inspectable engineering; SCCI_RH develops its own spinal architecture and artifacts. Substantial AI assistance is documented in the contribution record.

Engineering release: v2.1.1. Browser inspection and guide refresh: 21 October 2026. The paper and verified engineering geometry and circuit behavior are preserved through the recorded name migration. Historical stage records remain available; use the guides above for the current reading order. The technical inspector supports engineering review; presentation website and video work remain parked.

Parts

72
QtyValueFootprintReferences
4110kscci_rh_controller:R_0805_2012MetricR80002, R80100, R80101, R80102, R80103, R80104, R80105, R80106, R80107, R80108, R80109, R80110, R80111, R80112, R80113, R80114 +25
5100n X7R 10Vscci_rh_controller:C_1206_3216MetricC80003, C80010, C80011, C80012, C80013
4MountingHole_3.2mm_M3MountingHole:MountingHole_3.2mm_M3H1, H2, H3, H4
4SN74LVC165APWRscci_rh_controller:TSSOP-16_4.4x5mm_P0.65mmU80010, U80011, U80012, U80013
10Rscci_rh_controller:R_0805_2012MetricR80001
11u X7R 10Vscci_rh_controller:C_1206_3216MetricC80002
147u X7R 10Vscci_rh_controller:C_1206_3216MetricC80001
1ACTIVE ROUTE READBACKscci_rh_controller:PinHeader_1x09_P2.54mm_VerticalJ80017
1DAC SERIALscci_rh_controller:PinHeader_1x04_P2.54mm_VerticalJ80014
1DOSE / MONITOR REARMscci_rh_controller:PinHeader_1x05_P2.54mm_VerticalJ80013
1DRIVER REQUEST / POLARITYscci_rh_controller:PinHeader_1x09_P2.54mm_VerticalJ80015
1FANSTEL BT40F / nRF5340scci_rh_controller:BT40F_Manufacturer_66PadU80001
1HOST POWERscci_rh_controller:PinHeader_1x02_P2.54mm_VerticalJ80001
1ISOLATED COMPANION HOST UARTscci_rh_controller:PinHeader_1x04_P2.54mm_VerticalJ80020
1ISOLATED RECORDING HOSTscci_rh_controller:PinHeader_1x10_P2.54mm_VerticalJ80011
1NATIVE HEALTH OBSERVATIONSscci_rh_controller:PinHeader_1x19_P2.54mm_VerticalJ80019
1RAW MONITORscci_rh_controller:PinHeader_1x06_P2.54mm_VerticalJ80010
1RESET SHORTING HEADERscci_rh_controller:PinHeader_1x02_P2.54mm_VerticalJ80003
1ROUTE CANDIDATE / COMMITscci_rh_controller:PinHeader_1x09_P2.54mm_VerticalJ80016
1SHARED CHARGE ENDPOINT SPIscci_rh_controller:PinHeader_1x07_P2.54mm_VerticalJ80012
1SUPERVISION CONTROLscci_rh_controller:PinHeader_1x08_P2.54mm_VerticalJ80018
1SWD / TARGET VREFscci_rh_controller:PinHeader_1x06_P2.54mm_VerticalJ80002

Questions

How big is the Controller carrier PCB?

It measures 155 × 150 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Controller carrier use?

72 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Controller carrier KiCad files?

From the pratham-cloud-ctrl/Project-SCCI-RH repository on GitHub, at the commit this page was made from: the board is electronics/stage4/integrated-pcb/boards/controller-carrier/controller_carrier.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Controller carrier design in my own project?

Its repository states no licence, so its author keeps all rights: ask pratham-cloud-ctrl before reusing the design.

More from pratham-cloud-ctrl/Project-SCCI-RH

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