PCB Net Routing Assistance

vivekkailash

vivekkailash

Route all unrouted nets on this PCB

flux

I’ll route the remaining airwires, then run a board check to verify no unrouted nets remain.

flux

Routing is blocked because every PCB component is still set to auto-position; I’ll place the components first, then retry routing.

flux

I placed all 22 PCB components and confirmed the board is now ready for auto-routing. Routing could not be started because your account has no available ACUs right now, so AI execution is paused.
Open items:
  • Auto-route all remaining nets.
  • Run the final routing/airwire check after routing completes.
Suggested next steps:
  1. Add/restore ACUs, then ask me to “continue routing.”
  2. After routing, ask me to verify the PCB for remaining airwires and rule issues.
Continue routing
Verify after routing
Manual routing help
Check routing bottlenecks

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Project Specification — Low-Cost RCD Demonstrator
Project Overview
Status: Draft
This project is a safe, low-voltage educational demonstrator that explains the sensing and trip logic used in residual-current devices (RCD/GFCI-style protection). It is intended for learning and laboratory demonstration only, not for direct mains installation or certified bathroom/kitchen protection.
Intended Use
  • Student/educational prototype for rural wet-area protection concepts.
  • Uses low-voltage isolated supply and simulated leakage current.
  • Demonstrates trip detection, latch behavior, reset, test injection, and indicators.
What the Device Should Do
  • Sense imbalance current with a current transformer input.
  • Convert CT output into a filtered signal.
  • Compare sensed leakage against an adjustable threshold.
  • Latch a trip state when leakage exceeds the threshold.
  • Drive an LED/buzzer/relay-output indicator.
  • Provide TEST and RESET buttons.
Main Features
  • Low-cost analog front end.
  • 5 V operation.
  • CT input connector for isolated residual-current sensor.
  • Adjustable threshold for demonstration calibration.
  • Trip latch and visible indicators.
  • Relay driver output for non-mains demo loads only.
System Architecture
Diagram



  
    
  
  
    
  
























"Current Transformer Input"
"Burden + RC Filter"
"Comparator Threshold Detector"
"Adjustable Reference"
"Trip Latch"
"Test Button"
"Reset Button"
"Trip LED / Buzzer"
"Demo Relay Driver"
"5 V Isolated Input"
"5 V Rail + Decoupling"
Hardware Subsystems
  • Power: 5 V isolated input via header or USB power module; no direct mains power supply on this PCB.
  • Sensing: Current-transformer secondary, burden resistor, clamp/filter network.
  • Threshold: Comparator using adjustable potentiometer reference.
  • Latch: Logic latch or transistor latch to hold trip until reset.
  • Output: LED indicator and low-voltage relay/driver output.
  • Controls: TEST and RESET pushbuttons.
Interfaces and Connections
  • 5 V input connector.
  • CT secondary connector.
  • TEST/RESET pushbuttons.
  • Indicator LEDs.
  • Low-voltage relay/demo output connector.
Power and Runtime Expectations
  • Input: 5 V DC isolated supply.
  • Expected current: under 150 mA excluding external relay coil.
  • Relay coil current must be confirmed from selected relay datasheet.
Power Tree and Power Budget

Table

RailSourceLoadsEstimated Current
5VIsolated 5 V inputcomparator, latch, LEDs, relay driver<150 mA target
GND5 V returnall low-voltage circuitrycommon return only
Manufacturing and Assembly Expectations
  • Low-cost student prototype.
  • Prefer through-hole or hand-solderable parts where available.
  • Board must include clear silkscreen warning: educational low-voltage demonstrator only.
Firmware-Relevant Hardware Requirements
  • None planned; design is analog/discrete logic.
Physical Design Expectations
  • Keep CT input and analog comparator trace short.
  • Keep relay/driver output physically separated from sensing front-end.
  • Provide labeled test points for 5V, GND, CT_SIGNAL, VREF, TRIP.
Important Design Decisions
  • Avoid direct mains circuitry for safety and certification reasons.
  • Use simulated leakage/test injection rather than live wet-area loads.
  • Use an adjustable threshold to support classroom demonstrations.
Assumptions
  • This is not a certified RCD/GFCI product.
  • Demonstration supply is isolated 5 V DC.
  • External CT and relay are selected for low-voltage demonstration only.
Change Notes
  • Initial safe educational project scope created from user request.

  • Project Overview

  • Intended Use

  • What the Device Should Do

  • Main Features

  • System Architecture

  • Hardware Subsystems

  • Interfaces and Connections

  • Power and Runtime Expectations

  • Power Tree and Power Budget

  • Manufacturing and Assembly Expectations

  • Firmware-Relevant Hardware Requirements

  • Physical Design Expectations

  • Important Design Decisions

  • Assumptions

  • Change Notes

Documents

Assets

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

Low-Cost RCD Demonstrator thumbnail
Safe low-voltage educational residual-current device demonstrator for wet-area protection concepts

Properties

V

Pricing & Availability

Distributor

Qty 1

Arrow

$0.90–$4.11

Digi-Key

$1.10–$4.13

HQonline

$0.62–$0.65

LCSC

$12.23–$13.29

Mouser

$6.75–$9.50

TME

$0.98–$1.67

Verical

$5.34–$155.48

Controls