Industrial STM32 Controller Design with Isolated 4-20mA Output and RS485 Modbus RTU

@hayteekeys

HI, KINDLY READ THROUGH MY PROPOSAL I will design a compact, industrial-grade controller PCB (max 40 × 70 mm) that reads sensor data via UART, generates a galvanically isolated 4–20 mA output, and supports RS485 Modbus RTU for future SCADA/PLC integration, using an STM32G0 MCU. MY APPROACH ✅ Phase 1: Architecture & component selection (STM32G0, isolated 4-20mA using XTR115 or similar, isolated RS485, robust power section). ✅ Phase 2: Complete schematic and compact 4-layer PCB layout with proper isolation barriers, thermal management and industrial protections. ✅ Phase 3: Full manufacturing package and documentation. RELEVANT PROJECTS • Multiple compact industrial sensor-to-4-20mA converters and Modbus RTU gateways (STM32G0/L4, isolated analog output, RS485) for harsh environments, delivered production-ready designs within 2 weeks. DELIVERABLES • Full schematic and PCB layout source files (KiCad) • Gerber, drill, pick-and-place, and 3D STEP • Final BOM with industrial-grade parts and alternatives • Architecture document + design notes Timeline: (schematic in 4–5 days, layout + manufacturing files in 7–8 days, one major revision included). QUESTIONS 1. Can you share the current block diagram or sensor UART protocol details? 2. Any preferred isolated 4-20mA solution (XTR, DAC + opto, etc.)? 3. Confirm maximum power budget and enclosure constraints? Ready to start immediately. I will propose a clear architecture once I receive the initial details.

@abdurRafiqM

HI, I am an experienced electronics and PCB Design engineer, specialised in use of ECAD software such as Altium Designer, KICAD, EasyEDA, etc. for the the design of electronics and PCB. I will design your projects to meet your Requirements and the industry standard. I do all kinds of circuits such as Power delivery circuit, Sensor Integrated Circuits, wireless control, MCUs etc. I will deliver the following. The Schematics for your Design The PCB for the design Bill of materials(If needed) Gerber, Pick and Place and other manufacturing and assembly drawings needed. Full Support and consultancy till the project is done. Kindly send me message for my previous designs and also so we can discuss further on your project I look Forward to working with you. Best Regards, Abdur-Rafiq

@Webslinger01

Your industrial STM controller project is exactly the kind of work I do best. I have over a decade of experience designing production‑grade embedded systems, and I’ve shipped custom STM‑based controllers for clients across industrial automation, energy monitoring, and smart infrastructure. I don’t just write firmware—I design the PCB, handle the 3D enclosure, and deliver a fully tested prototype that’s ready for deployment. I’ve built systems that use CAN, RS485, and Modbus for reliable communication in harsh environments, and I know how to optimize for real‑time performance and power efficiency. If you want a controller that works reliably in the field, not just on a bench, let’s talk.

@soniaer987

I came across your project for the industrial STM controller design and it really caught my attention. I have six years of hands-on experience working with STM microcontrollers and building reliable control systems, and I genuinely enjoy tackling challenges like this one. I’ve worked on projects where precision timing and robust communication were critical, including a smart HVAC control system that used RS485 and MQTT protocols, and a custom PCB for an industrial monitoring device that shipped to a client in the Netherlands. I can handle everything from firmware development to PCB layout and enclosure design, and I’ll make sure your prototype is fully tested before it ships. I’d love to discuss your specific requirements and help bring this controller to life.