KiCad Project Overview
Thought
Work done
- Audited the uploaded KiCad sources and confirmed the original design used mixed packages: all checked resistors were already 0603, while multiple capacitors in the KiCad PCB were still 0805 and needed migration.
- Identified connector packaging from the KiCad PCB: J4 USB-C and J6 RJ45 were through-hole in the original, and header / terminal connectors were also through-hole.
- Renamed the project and updated the description to reflect the packaging policy: all resistors and capacitors -> 0603 SMD, connectors kept through-hole only where mechanically required.
- Rebuilt the project from an empty state by adding the gateway’s major blocks: U3 ESP32, U2 W5500, U7 MCP2515, U8 SN65HVD230, U9 MAX3485, U5 CH340C, U4 LM1117, connectors J4 / J6 / J3 / J5 / J2 / J7 / J8, protection D1 / D2, status LED D3, switch SW1, crystals Y1 / Y2, and all currently added passives R1-R8, C1-C12 as 0603.
- Created project files for traceability: Design Notes and Firmware Starter.
Success criteria review
- ✅ The project metadata and newly added passive components now follow the 0603 SMD packaging policy.
- ✅ Connector selections were re-audited and chosen with through-hole retained only where mechanically justified, such as J4, J6, J7, J8, J5, and J2.
- ✅ Project documentation was updated to reflect the packaging migration and reconstruction basis.
- ❌ I could not complete a full like-for-like migration of the original industrial gateway because the live Flux project initially contained no imported schematic / netlist data, so the original connectivity had to be reconstructed manually.
- ❌ I could not run a meaningful final ERC / DRC / manufacturability validation against the intended finished gateway because the schematic reconstruction and PCB footprint assignment / placement were not yet completed end-to-end.
- ❌ I could not verify that all original resistors and capacitors from the KiCad design were migrated in-place, because the original project content was not available as editable imported components inside the live project.
Next steps
- The next step is to finish schematic reconstruction and wiring from the KiCad source so the gateway functions are fully restored, then proceed to PCB layout work: board sizing, stackup selection, component placement, and final DRC.
- If you want, I can continue from this rebuilt baseline by wiring the power, USB-UART, CAN, RS485, SD, and Ethernet sections, then move directly into PCB layout preparation.
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Project Specification
Scope
Recreate a complete industrial gateway design as a Flux project titled Industrial gateway for Multi-Protocol. The design is based on the uploaded reference screenshots and original KiCad files, and centers on an ESP32-WROOM-32E.
Architecture
Diagram
Required Subsystems
- ESP32-WROOM-32E main controller
- Ethernet using W5500 and Hanrun HR911105A
- CAN using MCP2515 and SN65HVD230
- RS485 using MAX3485 with 120 ohm termination
- USB-C input, CH340C USB-UART bridge, and BC817 auto-reset transistors
- SD card interface
- I2C header with 4.7k pull-ups
- Analog and digital IO headers
- Status LED and user switch
Power Strategy
- USB-C sink-only 5V input with CC pull-down resistors
- 5V protection and local bulk capacitance
- 3.3V rail for ESP32 and peripheral ICs
- 100nF decoupling per IC power pin plus local bulk capacitors
PCB Preparation Goals
- Assign footprints to all critical parts
- Use a 4-layer stackup suitable for ESP32, Ethernet, SPI, CAN, and RS485 routing
- Define board size and placement strategy for connectors, RF keepout, and communication interfaces
- Prepare the design for placement and later routing review in Flux
Scope
Architecture
Required Subsystems
Power Strategy
PCB Preparation Goals
