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4 layers175 × 155 mmCurrent driver, the printed circuit board in 3D

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

Size
175 × 155 mm
Copper layers
4
Thickness
1.6 mm
Parts
160
Nets
106
Pads
576
Tracks, vias
2,234, 256
Routed
Yes
KiCad
KiCad 10.0 (file 20260206)
Created
7 Oct 2026
Updated
29 Oct 2026

Overview

Current driver 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 175 × 155 mm with 160 parts on 106 nets, routed with 2,234 tracks and 256 vias.

It is built around the DAC80502DRXR, SN74LVC1G11DBVR(AT) and SN74LVC1G08DBVR, with the SN74LVC1G04DBVR, TMUX6219DGKR and LTC6993HS6-1#TRPBF among its other parts. Its parts include 57 capacitors, 51 ICs, 39 resistors, 7 connectors and 2 transistors. It belongs with the interfaces and adapters boards of this library.

Main components

9

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

160
QtyValueFootprintReferences
43100n 10Vscci_rh_drv:C_0805_2012MetricC20001, C20300, C20301, C20302, C20303, C20304, C20305, C20306, C20307, C20308, C20309, C20310, C20311, C20312, C20313, C20314 +27
2110kscci_rh_drv:R_0805_2012MetricR20001, R20002, R20003, R20004, R20005, R20303, R20304, R20305, R20306, R20307, R20308, R20309, R20310, R20403, R20404, R20405 +5
12SN74LVC1G11DBVRscci_rh_drv:SOT-23-6U20302, U20303, U20310, U20311, U20317, U20318, U20402, U20403, U20410, U20411, U20417, U20418
10SN74LVC1G08DBVRscci_rh_drv:SOT-23-5U20304, U20307, U20309, U20319, U20320, U20404, U20407, U20409, U20419, U20420
8SN74LVC1G04DBVRscci_rh_drv:SOT-23-5U20305, U20306, U20308, U20312, U20405, U20406, U20408, U20412
6100n 25Vscci_rh_drv:C_0805_2012MetricC20101, C20102, C20103, C20201, C20202, C20203
622kscci_rh_drv:R_0805_2012MetricR20103, R20104, R20105, R20203, R20204, R20205
6SN74LVC1G74DCURscci_rh_drv:VSSOP-8_2.3x2mm_P0.5mmU20313, U20315, U20316, U20413, U20415, U20416
4MountingHole_3.2mm_M3MountingHole:MountingHole_3.2mm_M3H1, H2, H3, H4
4TMUX6219DGKRscci_rh_drv:VSSOP-8_2.3x2mm_P0.5mmU20102, U20103, U20202, U20203
2100R 0.1% LOW TCRscci_rh_drv:R_0805_2012MetricR20100, R20200
2100kscci_rh_drv:R_0805_2012MetricR20102, R20202
2100n 50Vscci_rh_drv:C_0805_2012MetricC20104, C20204
2175.8k 0.1%scci_rh_drv:R_0805_2012MetricR20300, R20400
2182k 0.1%scci_rh_drv:R_0805_2012MetricR20302, R20402
21u 50Vscci_rh_drv:C_0805_2012MetricC20105, C20205
2330Rscci_rh_drv:R_0805_2012MetricR20101, R20201
2976k 0.1%scci_rh_drv:R_0805_2012MetricR20301, R20401
2BSP89H6327XTSA1scci_rh_drv:BSP89_PG-SOT223-4_DrainTabQ20100, Q20200
2DNP 10p C0Gscci_rh_drv:C_0805_2012MetricC20100, C20200
2EXTERNAL ROUTER / MONITORscci_rh_drv:PinHeader_1x04_P2.54mm_VerticalJ20100, J20200
2LTC6993HS6-1#TRPBFscci_rh_drv:TSOT-23-6U20300, U20400
2OPA192IDBVRscci_rh_drv:SOT-23-5U20100, U20200
2SN74LVC1G32DBVRscci_rh_drv:SOT-23-5U20314, U20414
2SN74LVC1G86DBVRscci_rh_drv:SOT-23-5U20301, U20401
2TMUX7212PWRscci_rh_drv:TSSOP-16_4.4x5mm_P0.65mmU20101, U20201
1220n 10Vscci_rh_drv:C_0805_2012MetricC20003
14.7u 10Vscci_rh_drv:C_0805_2012MetricC20002
1DAC80502DRXRscci_rh_drv:Texas_DRX_WSON-10_2.5x2.5mm_P0.5mmU20001
1EXTERNAL HEALTH CONTRACTSscci_rh_drv:PinHeader_1x11_P2.54mm_VerticalJ20004
1MCU PHASE / EXPLICIT REARMscci_rh_drv:PinHeader_1x09_P2.54mm_VerticalJ20003
1MCU SPI / PRELOAD INHIBITEDscci_rh_drv:PinHeader_1x04_P2.54mm_VerticalJ20002
1QUALIFIED EXTERNAL RAILSscci_rh_drv:PinHeader_1x05_P2.54mm_VerticalJ20001
1STATUS ONLY / NOT DELIVERY EVIDENCEscci_rh_drv:PinHeader_1x09_P2.54mm_VerticalJ20005

Questions

How big is the Current driver PCB?

It measures 175 × 155 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Current driver use?

160 parts, built around the DAC80502DRXR, SN74LVC1G11DBVR(AT), SN74LVC1G08DBVR and SN74LVC1G04DBVR. 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 Current driver 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/current-driver/current_driver.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Current driver design in my own project?

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

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