PCB Design for Arduino Integration

flux

0:07

Work done
  • Updated the project name and description for the Arduino Nano R4 Wiegand carrier board.
  • Corrected the schematic mapping so J4 is the READER terminal and J1 is the PANEL terminal.
  • Rewired the required signals: J4 D0 -> U3 D2, J4 D1 -> U3 D3, J1 D0 -> U3 D5, and J1 D1 -> U3 D4.
  • Verified the pull-up network on R3 and R4 to the +5V rail for the READER data lines.
  • Connected U3 VIN to the protected VIN path and tied both Nano ground pins into GND.
  • Changed the layout stackup from 4-layer to Standard 2 Layer.
  • Created and updated the Project Specification with the architecture diagram and exact signal mapping.
Success criteria review
  • ✅ READER terminal connections are implemented with pull-ups on the input data lines.
  • ✅ PANEL terminal remapping is implemented for Brivo compatibility.
  • ✅ The board stackup is now 2-layer.
  • ❌ I could not complete the final PCB placement/routing refinement and final manufacturability pass because an issue occurred while running the automated placement step.
  • ❌ The layout still shows unrouted connections, so the PCB portion is not yet fully complete.
Next steps The schematic is now aligned to the plan, but the PCB still needs placement refinement and routing cleanup to satisfy the full layout criteria. I can continue from here by retrying layout placement and then reviewing the remaining unrouted connections once the issue is resolved.
Retry PCB placement
Review remaining airwires
Open project spec
4 days
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Project Specification
Overview
Arduino Nano R4 inline Wiegand carrier board that sits between a card reader and an access control panel. The board uses a removable Nano socket, passes 12 V through to Nano VIN, remaps Wiegand signals for Brivo panel compatibility, and preserves USB access at the board edge.
Diagram



  
    
  
  
    
  







GND

12V

GND





READER terminal
Arduino Nano R4 socket
PANEL terminal
12V input to VIN
Reader data pullups to node_5V
Requirements
  • 2-layer PCB
  • Arduino Nano R4 socket implemented with 2x15 female headers
  • USB connector on the Nano faces a board edge for access
  • READER terminal pin order left-to-right: D0, D1, GND, +12V
  • PANEL terminal pin order left-to-right: D0, D1, GND, +12V
  • READER D0 maps to Nano D2 with pull-up resistor
  • READER D1 maps to Nano D3 with pull-up resistor
  • PANEL D0 maps to Nano D5
  • PANEL D1 maps to Nano D4
  • Common ground shared by reader, panel, and Nano
  • +12V from terminals feeds Nano VIN path
Current implementation notes
  • Existing project scaffold already includes Nano module, two 4-position screw terminals, pull-up resistors, reverse-polarity diode, 5 V regulator stage, TVS protection, decoupling, indicator LED, mounting holes, and a routed PCB.
  • Schematic is being aligned so connector roles and signal mappings exactly match the approved plan.
  • PCB stackup must be changed to 2-layer during layout stage review.

    Overview

    Requirements

    Current implementation notes

Documents

    Project Specification

Assets

Assets are files uploaded to this project which can be used in various ways.

Arduino Nano R4 Wiegand Inline Carrier thumbnail
2-layer Arduino Nano R4 inline Wiegand carrier board with reader and panel screw terminals, Brivo-compatible data remapping, and 12V pass-through to VIN.

Properties

Diagram



  
    
  
  
    
  




















"READER Terminal J2"
"Input Protection and Pullups"
"Arduino Nano R4 U1"
"PANEL Terminal J3"
"12V Input"
"Reverse Polarity Diode D1"
"AMS1117 node_5V Regulator U2"
"JP1 PWR SEL"
"Power LED1"
"Activity LED2"

Pricing & Availability

Distributor

Qty 1

Arrow

$1.72–$3.36

Digi-Key

$3.72–$4.98

LCSC

$4.86–$5.54

Mouser

$3.38–$4.79

TME

$5.51–$6.47

Verical

$1.40–$5.36

Controls