JamPsym/letkiA new schematic simplification is in progress. See the next-iteration note for the checked 33 Ω candidate. This directory and its frozen exports still represent the previous 34 Ω circuit; the candidate has no…
Ledkiv2 is an open-source printed circuit board by JamPsym, from the JamPsym/letki repository on GitHub. It is a 2-layer board of 39 × 41.4 mm with 78 parts on 32 nets, routed with 237 tracks and 83 vias.
Its parts include 64 diodes, 8 resistors and 1 connector.
A new schematic simplification is in progress. See the next-iteration note for the checked 33 Ω candidate. This directory and its frozen exports still represent the previous 34 Ω circuit; the candidate has no synchronized PCB yet.
Open ledkiv3_1.kicad_pro. This is the completed Study C tile promoted into the main
repository on 2026-10-15. The original seed, electrical studies, archived v3 and initial
unrouted integration are preserved. ESP-12F and the custom power head are
explicitly deferred until hardware verification.
The tile retains stocked CH32V003F4P6 and SN74HC138PWR, with eight AO3415A
column sources and eight DMN2056U-7 row sinks. Each row has two 68Ω resistors
in parallel (34Ω). Supply is externally regulated 3.3V ±5%. All LEDs reverse
relative to v3. Use make VARIANT=v3_1-pulse; original v3 and repetitive
MOSFET-study firmware are incompatible. make v3_1-interface-demos builds
separate communication images that hold LED rows LOW.
The 40.64×49.27mm four-layer board is fully routed. Native ERC/DRC/open nets/ schematic parity/ignored checks are zero. Independent checks cover 369 retained core pins, 390 pads, ordinary tented vias, power geometry, fastener clearance and assembly markings. In1 crossovers are individually whitelisted; the ground plane remains connected. This establishes CAD intent, not pulse/current, thermal, optical, supply or production qualification.
Contacts are symmetric ordinary PTH wire holes: top-to-bottom 3V3/3V3/SDA/ SCL/UART/GND/GND. RX is on the left, TX on the right. Enable JP1/JP2 and fit R11/R12 on only one selected I²C pull-up tile. Rear PicoBlade 53047-0310 and bare pads share J2: 1 REF3V3, 2 SWIO, 3 GND. The current LinkE cable uses only pins2/3 with independent board power.
R4 is on the front at (16.45,27.7), beneath a closed pocket in the matching optical grid. JP2 is on the lower front at (33.5,45.3); remove optics for access. Silk numbers identify resistors, P1/P2 identify jumpers, C1–C5 retain prefixes. Full references remain in CAD/Fab/BOM. Six displaced marks have silk leaders.
First provisioning: leave R49 open and fit R38. Program/readback the matching
image, then separately authorize/set/readback PD7 GPIO configuration. Power OFF
before fitting R49. Verify debug timer-freeze behavior before powered breakpoint
work. Read docs/v3_1-assembly-test.txt from the repository root.
Generate the checked package from the repository root:
PCB_GEOMETRY_PYTHON=/path/to/python-with-pcbnew-and-shapely python3 scripts/v3_1_package.pyRequires KiCad10 CLI/Python, Shapely2, FreeCAD/Pillow host dependencies and WCH
GCC configured as documented in docs/arch-setup.md. Current installed geometry
Python is in this repository's ignored .tools/kicad-routing-env/.
The exporter checks frozen sources and produces exports/prototype/ with
Gerbers/drills, schematic, assembly/BOM, matched firmware, populated STEP,
printable 1/4-tile mechanics, source/artifact hashes and qualification worksheet.
Every physical qualification row remains pending. Confirm actual fabricator
preview/process and fresh parts/PCB/assembly prices before an authorized order.
No ordering, inventory changes or hardware access occur during packaging.
The existing exports/prototype package is the byte-identical session handoff; its manifest/source ZIP records the original session context. Do not interpret that frozen manifest as hashes of every current main-repository file. See docs/v3_1-handoff.txt and build/hardware/v3_1-migration/ for migration checks. The JLCONE quote currently forces Plugged instead of Tented: fabrication remains on hold until treatment of vias and open solder holes is reconciled.
Repository layout: this directory contains the active KiCad project directly, its project-local libraries/models and exports/. Superseded circuit study CAD is in archive/hw/ledkiv3.1-studies-20261015/. The pulse schematic there remains the checker's immutable electrical reference. General lessons are summarized in /home/pies/electronics/notes/circuits/2026-10-15-led-matrix-drive-studies.txt. See ../../docs/v3_1-handoff.txt for firmware, qualification and sourcing links.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 64 | LED | LED_SMD:LED_0805_2012Metric | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +48 |
| 8 | R | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R4, R5, R6, R7, R8 |
| 4 | , , , | ||
| 1 | Conn_01x02 | Connector_PinSocket_2.54mm:PinSocket_2x01_P2.54mm_Vertical | e1 |
| 1 | Conn_02x12_Counter_Clockwise | Library:ch32v003weact_SolderPad_15.24mm | J1 |
It measures 39 × 41.4 mm and has 2 copper layers, 1.6 mm thick.
78 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.
From the JamPsym/letki repository on GitHub, at the commit this page was made from: the board is archive/hw/ledkiv2/ledkiv2.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask JamPsym before reusing the design.
JamPsym/letki
A new schematic simplification is in progress. See the next-iteration note for the checked 33 Ω candidate. This directory and its frozen exports still represent the previous 34 Ω circuit; the candidate has no…
JamPsym/letki
A new schematic simplification is in progress. See the next-iteration note for the checked 33 Ω candidate. This directory and its frozen exports still represent the previous 34 Ω circuit; the candidate has no…
JamPsym/letki
A new schematic simplification is in progress. See the next-iteration note for the checked 33 Ω candidate. This directory and its frozen exports still represent the previous 34 Ω circuit; the candidate has no…
JamPsym/letki
A new schematic simplification is in progress. See the next-iteration note for the checked 33 Ω candidate. This directory and its frozen exports still represent the previous 34 Ω circuit; the candidate has no…
JamPsym/letki
A new schematic simplification is in progress. See the next-iteration note for the checked 33 Ω candidate. This directory and its frozen exports still represent the previous 34 Ω circuit; the candidate has no…
JamPsym/letki
A new schematic simplification is in progress. See the next-iteration note for the checked 33 Ω candidate. This directory and its frozen exports still represent the previous 34 Ω circuit; the candidate has no…
JamPsym/letki
A new schematic simplification is in progress. See the next-iteration note for the checked 33 Ω candidate. This directory and its frozen exports still represent the previous 34 Ω circuit; the candidate has no…
JamPsym/letki
A new schematic simplification is in progress. See the next-iteration note for the checked 33 Ω candidate. This directory and its frozen exports still represent the previous 34 Ω circuit; the candidate has no…
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