A 55 × 32 mm, 4-layer board that replaces the LilyGO T-2CANFD in the
indian-thunderstroke-canbus
project: ESP32-S3-WROOM-1U + MCP2518FD + TCAN332G, fed from the bike's
permanent 12 V through an LM5164 buck. Same pin map as the LilyGO board, so the
firmware runs unchanged (sniffer-t2can environment).
What it drops from the LilyGO board, on purpose: the isolated transceiver (one machine, one ground — the isolation was bridged the moment it was wired in, and its DC-DC was three quarters of the sleep current), the USB connector, the screw terminals, the second CAN channel, and the 120 Ω termination (the bike's bus is already terminated; a third resistor is a stub). What it adds: a 6–40 V input that survives load dump, four solder pads with strain-relief holes instead of connectors, and a ~10 µA regulator so the board can live on the battery.
canfd-mc.kicad_pro / .kicad_sch / .kicad_pcb KiCad 10 project — placed, routed, DRC clean
canfd_local.pretty/ three project footprints (solder pads with relief
holes, Murata DLW43SH with Murata's pin numbering)
production/ what JLCPCB was sent: Gerber zip, BOM, CPL
docs/design-document.html the full design document: BOM, net list, the
LM5164 calculation, layout rules, checklist
docs/BUILD-NOTES.md build, ordering and bring-up notes
docs/WIRING-PARTS.md antenna and service-connector cable to order
Four wires from the service connector, soldered to plated pads along the bottom edge — CANL · CANH · GND · VBAT. Each pad has an unplated 1.2 mm hole 3 mm inboard: thread the wire up through the hole and down into the pad, so the board takes the strain instead of the solder joint. No shield pad: the bus shield is grounded at the ECM.
Flashing pads on the back, 2.54 mm pitch — GND · EN · TX · RX · IO0 · USB_D+ · USB_D−. First flash goes over the ESP32-S3's native USB (a cut USB cable on D+/D−/GND; the board is powered from 12 V, not from USB). After that, OTA.
| Input | 6–40 V (LM5164 is rated to 100 V; the TVS clamps load dump at ~39 V) |
| UVLO | on at 7.0 V, off at 6.5 V |
| Output | 3.3 V, 300 kHz, 1 A rating (real load < 0.5 A) |
| Protection | 1 A fuse, series Schottky (reverse polarity), SMBJ24CA |
The buck was calculated from the LM5164 datasheet equations and confirmed with TI's WEBENCH: RON, inductor and bootstrap capacitor came out identical.
Rev 1.0. Ordered from JLCPCB in September 2026 (5 boards, assembled). Reviewed (docs/REVIEW-rev1.0.md): net list confirmed against the datasheets, three notes for rev 1.1. Not yet tested on hardware — this is a first revision, and the bring-up checklist in the design document is the plan for finding out what it got wrong.
Things a second revision might change are tracked in the design document's open-points table.
MIT, like the firmware. Design and silkscreen: Springcommand — Nanna Agesen 2026.