Arduino Nano DCC PCB Design THT -- 2

@SMBelectronics

Hi, I can handle this end-to-end. We design compact, single-board electronics exactly like this: clean signal conditioning, solid power stages, and layouts meant for real field wiring, not just theory. For your board, the focus will be on a reliable DCC input stage that safely converts track power into a clean 5 V logic signal for the Arduino Nano, with proper isolation and noise immunity. I’ll design the DCC receiver stage, on-board 5 V regulation from 14–18 V track power, and a Nano-matched pinout with one screw-terminal output per I/O pin. The PCB will include clear silkscreen labels, corner mounting holes, and a hardware switch to select DCC input between Nano pin 2 and pin 3. No motors, no extras, just robust accessory control. You’ll receive a complete schematic and PCB layout in KiCad (or Eagle if preferred), a fully specified BOM with manufacturer part numbers, and fabrication-ready Gerbers, drills, and pick-and-place files. I’ll also include a short design note covering component choices and current limits so you can order and validate with confidence. If you’re happy to proceed, send any Nano form-factor constraints or preferred terminal types, or we can do a quick call to confirm details and timeline. Best Regards Abbas Jawad Wala SMB ElectroTech I take on a limited number of hardware design projects to stay hands-on and accountable. If I commit, I’ll take this off your plate and deliver something you can directly manufacture and use.

@tetianam8

⭐⭐⭐⭐⭐ This is a clean, well-scoped hardware job, and it’s very much in my wheelhouse. I’ve designed several Nano-based and DCC-adjacent boards where the priority was signal integrity, simple field wiring, and easy manufacturing—not feature creep. I’d approach this as a true Nano shield: fully THT, rectangular, KF-301 screw terminals at the edges, and dual 15-pin female headers so the Nano drops straight in. For the DCC front end, I’d use a proven opto-isolated or comparator-based receiver topology to deliver a clean 5 V logic signal to the Nano, with a jumper selecting D2 or D3 as requested. Track power would be rectified and regulated onboard to a stable 5 V rail sized for logic plus accessory drive loads. Each Nano I/O would break out to its own labeled screw terminal, with clear silkscreen legends for field use. Mounting holes at all four corners, conservative trace widths, and JLCPCB-friendly design rules would be baked in from the start. No motors, no sound—just reliable accessory control. Deliverables would include KiCad schematics and layout, a clean BOM with part numbers, Gerbers/drill files ready to upload, and a short design note covering DCC input behavior and current limits. I can have a schematic ready for first review within a week and finalize files shortly after feedback. If you have a preferred DCC receiver reference circuit or current targets per output, I’m happy to align to that up front.