Wire Harness Testing Schematic and PCB Design -- 2

@markoa7

Cześć. Dziękuję za szczegóły projektu. Zgłaszam się do zaprojektowania kompletnego hardware’u do testowania przewodów o łączności 50 linii, z uwzględnieniem 25 par A/B. Skoncentruję się na solidnym schemacie i PCB z wejściem 9-32 V, stabilizacją na 3.3 V, ochroną przed 12/24 V na każdej linii (1× rezystor 330 Ω + klamry/diody) oraz rozmieszczeniem MCP23017 na I2C z unikatowymi adresami. Projekt uwzględni półprzewodnikowy układ zasilania, filtrację i EMI, a także moduł USB-C do programowania ESP32 i ESD na liniach USB. Szczegóły dotyczące układu będą dokumentowane w plikach projektowych i BOM. Jaka jest preferowana metoda debugowania podczas fazy hardware? Czy wolałby Pan/Pani krótkie testy I2C Scan i LEDów na starcie, czy bardziej rozbudowaną procedurę testową?

@electronicsdone

Best Wire Harness Test PCB Design Expert ⭐⭐⭐⭐⭐ Hi, Thank you for posting your project, “Wire Harness Testing Schematic and PCB Design.” I’ve carefully reviewed your requirements and can help you design a robust, production-ready PCB for testing cable harnesses up to 25 wires per side with strong protection against accidental 12 V / 24 V exposure. I bring 11+ years of experience in industrial electronics, ESP32-based hardware design, protected digital I/O systems, and EMI-aware PCB layout. ✅ How I’ll Help You Succeed 1. Design a clear, well-documented schematic using ESP32-WROOM with MCP23017 I/O expanders and correctly addressed I2C architecture. 2. Implement per-line protection for all A/B harness connections, including mandatory series resistors and calculated clamp/protection networks safe for accidental 12 V / 24 V exposure. 3. Create a clean, EMI-aware PCB layout with proper ground strategy, protected power input (9–32 V), and safe separation of switching regulation from signal paths. ✅ Before I start, one quick question: Do you prefer simple resistive + diode/TVS clamping per line, or would you like me to evaluate a buffered or semi-isolated approach if it improves survivability and long-term robustness within a reasonable cost? If you share that, we can align quickly and move forward. Best regards, Prat PCB Must Innovations

@yaroslavmark

✅Okay, I got what you want exactly. I am a Senior Hardware Design Engineer with over 10 years of experience, providing industrial PCB design, power electronics, ESP32-based embedded systems, and robust I/O protection solutions. In my opinion, the key to this project is building a hardware platform that’s electrically bulletproof before firmware even comes into play. I would design the A/B input stage with calculated series resistance, fast clamping, and controlled fault current paths so that accidental 24V exposure won’t stress the ESP32 or MCP23017 devices, while keeping the layout clean and EMI-safe around the switching regulator and I2C routing. This project is very similar to my previous works. I recently designed a 48-channel industrial cable tester using STM32 + 3× MCP23S17 expanders with per-line protection against 28V DC miswiring, including TVS arrays and current-limited clamp networks calculated for 5-second fault scenarios. I also completed a 9–36V powered ESP32 control board with buck conversion, USB-C auto-programming (CP2102N), and fully documented Gerbers, BOM with alternates, and pick-and-place files prepared for JLCPCB assembly. Via private chatting or meeting, I will provide the creative idea and good tech solution for your project and i want to discuss about the budget and timeline in detail. Best regards. Yaroslav

@antonk52

With a background in electronics and circuit design, I bring the necessary skillset to handle your Wire Harness Testing Schematic and PCB Design project diligently. My primary focus will be on designing a single PCB device for reliable testing of your cable harnesses. I am well-versed in using widely available components such as ESP32-WROOM and MCP23017, which will maximize both the accessibility and quality of the board. As you have emphasized the need for a robust hardware design, you can rely on my expertise for that. Reverse polarity protection, TVS on input, fuse/polyfuse with proper filtering, EMI-aware layout - these are all vital requirements that I am confident in meeting. Moreover, my meticulous approach toI'll also make sure that all A/B lines are adequately protected against any accidental voltages to ensure the safety and durability of your device. In terms of deliverables, rest assured that you'll receive comprehensive documentation: KiCad/Altium/Eagle(Fusion360) project files, Gerbers + drill files, BOM with specifications and alternatives, Pick&place/assembly position files (if needed). I understand that this is a critical phase before the firmware implementation, and I'm committed to providing you with a qualitatively dependable hardware foundation for your testing solution. Let's work together to achieve seamless connectivity and accurate cable testing with improved productivity!