Floating Copper Error Resolution

flux

0:30

Capito. Allora la cosa utile adesso è gestire il rischio, non rimuginare.
Cosa significa davvero
  • Se il preview JLC mostrava U1 ruotato, c’è un rischio reale di orientamento errato in assembly.
  • Però il preview JLC può anche avere problemi di allineamento/mapping e non essere perfettamente affidabile da solo; per file e screenshot bisogna sempre collegare l’immagine al contesto reale del progetto, non trattarla come verità assoluta
  • Nei file allegati e nei preview la regola giusta è: essere specifici sul rischio e passare a un recovery path chiaro, non generico
Cosa fare subito
Se l’ordine è già partito, fai queste 3 cose:
  1. Contatta subito JLCPCB
  • Apri il ticket/order note e scrivi che vuoi una manual placement/orientation check per U1, U6, Q2, Q1, D2, D3.
  • Dì esplicitamente che il CPL preview sembra avere orientamenti errati.
  1. Allega uno screenshot corretto del PCB
  • Quello con il layout reale di Flux.
  • Evidenzia soprattutto U1 con una nota tipo:
    • “tab a destra/sinistra” a seconda della tua vista di riferimento
    • “do not rotate 180 degrees from PCB layout reference”
  1. Chiedi conferma prima del montaggio
  • Chiedi che ti mandino conferma DFM/CAM o screenshot placement prima di assemblare, se l’ordine è ancora in quella fase.
Messaggio pronto da mandare a JLC
Puoi incollare questo:
Please pause assembly if possible and manually verify component orientation against the PCB layout for these parts: U1, U6, Q1, Q2, D2, D3.
The CPL preview appears to show at least U1 rotated incorrectly relative to the PCB footprint.
Please use the PCB silkscreen / pad orientation as reference and confirm placement before assembly.
Quanto è grave
  • Se l’ordine è ancora in review / pending / CAM, potresti ancora salvarlo.
  • Se è già in assembly completed, allora bisognerà aspettare la scheda e verificare.
  • I componenti più critici se girati male sono:
Quando arrivano le schede
Prima ancora di alimentarla:
  • ispeziona visivamente U1
  • verifica polarità di D2, D3, D1
  • verifica orientamento di U6
  • misura resistenza tra VIN e GND
  • poi alimenta con corrente limitata
Mia raccomandazione
Scrivi subito a JLC adesso.
È la mossa con il miglior rapporto impatto/tempo.
Se vuoi, nel prossimo messaggio ti preparo un testo ancora più preciso, già formattato per ticket JLC, in inglese corto.
Scrivi il ticket JLC
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Project Specification
Design Summary
Status: Draft
Manufacturing target: Prototype
Software / firmware: ESP32 firmware with timed relay pulse output
Scope
Purpose
Develop a production-grade prototype PCB for a golf ball dispenser machine. Use the uploaded reference only as architectural guidance while removing unnecessary legacy circuitry. The board accepts 12V-24V DC input, generates 5V locally, hosts an ESP32-WROOM-32 based 38-pin ESP32 development board with native USB, drives a 5V relay from an ESP32 GPIO, and exports a fully isolated dry-contact relay output that emulates a mechanical coin-trigger push-button closure.
In scope
  • 12V-24V DC power input through a screw terminal
  • Reverse-polarity and input filtering protection
  • 12V-24V to 5V buck conversion
  • ESP32 development board interface powered from the 5V rail
  • Relay coil drive using an on-board transistor stage
  • Flyback protection across the relay coil
  • Dedicated dry-contact output terminal using only COM and NO
  • Optional debug connector only if it adds capability beyond the ESP32 onboard USB
Out of scope
  • Using relay NC in the output path
  • Driving external voltage onto the relay contact output
  • Adding separate USB interface circuitry on the PCB
System context
This board acts as a controller interface for a golf ball dispenser machine. The PCB accepts 12V-24V DC from the machine, generates a regulated 5V rail, powers an ESP32 development board, and uses a transistor-switched relay to present an isolated contact closure to the machine coin-trigger input.
Key interfaces
  • Power input: J1 12V-24V DC machine supply
  • 5V buck stage: converts input power to regulated 5V for logic and relay coil
  • Controller: ESP32-WROOM-32 based 38-pin development board mounted on PCB headers
  • Dry contact output: RELAY_OUT routed only to K1 COM and NO
Attach: simple block diagram
Diagram



  
    
  
  
    
  
























POWER_IN J1 node_12V to node_24V
Input Protection
5V Buck Converter
5V Rail
ESP32 DevKitC 38 pin Headers
Relay Coil K1
GPIO Relay Control
Base Resistor R1
Q1 NPN Driver
Flyback Diode D1
Relay COM and NO
RELAY_OUT 2 Pin Dry Contact
Requirements
Functional
  • The board shall accept 12V-24V DC from the machine and generate a stable 5V rail.
  • The board shall power an ESP32-WROOM-32 based 38-pin development board from the 5V rail while still allowing native USB use on the dev board.
  • The board shall allow an ESP32 GPIO to drive the relay transistor stage.
  • The board shall expose only relay COM and NO on the dry-contact output terminal.
  • The board shall leave relay NC unused.
  • The board shall emulate a momentary mechanical push-button closure for the machine coin-trigger input.
Electrical
  • Input power: 12V-24V DC on J1
  • Key rails: VIN, 5V, and GND on PCB side only
  • Relay coil supply: 5V rail
  • Coil protection: flyback diode across K1 coil
  • Isolation requirement: RELAY_OUT must not connect to VIN, GND, or any powered PCB rail
Mechanical / environmental
  • Through-hole relay, power terminal, dry-contact terminal, and 38-pin ESP32 header interface used for simple assembly and robust field wiring
Key constraints
  • Keep the relay coil driver topology conventional: NPN low-side switch with flyback diode
  • Use an ESP32-WROOM-32 based 38-pin development board with onboard USB instead of a bare ESP32 module
  • Avoid back-power conflicts between the PCB 5V rail and the ESP32 dev board USB input
  • RELAY_OUT must be a true dry contact using only COM and NO
  • No PCB rail may be routed onto the relay contact side
Dependencies and risks
Dependencies
  • External machine provides 12V-24V DC input power
  • External coin pulse input expects a passive contact closure on RELAY_OUT
Key risks
  • ESP32 dev board pinout must match the chosen 38-pin DevKitC footprint in the library
  • USB back-power behavior depends on the chosen dev board implementation and must be handled conservatively
Validation
Success criteria
  • J1 accepts 12V-24V input and the buck stage generates 5V
  • ESP32 dev board receives 5V and GND correctly from the PCB
  • K1 coil is driven from PCB 5V through Q1 and protected by D1
  • RELAY_OUT connects only to K1 COM and K1 NO
  • K1 NC is not connected
  • No PCB supply rail is present on RELAY_OUT
Planned checks
  • Inspect schematic nets for dry-contact isolation
  • Review 5V power distribution and ESP32 header mapping
  • Run ERC and DRC checks before prototype release
Release-facing notes
Expected deliverables
  • Schematic
  • BOM
  • Design notes in project documentation
Special release notes
  • RELAY_OUT is intentionally isolated and must remain free of applied PCB voltage
  • ESP32 onboard USB is the preferred programming and debug interface unless a non-redundant auxiliary header is later justified
Change notes / open questions
Changes in this revision
  • Existing relay driver retained as a starting point for refinement
  • Project scope expanded to full golf ball dispenser controller with power conversion and ESP32 dev board support
  • Controller interface updated from 30-pin ESP32-DEVKIT-V1 to 38-pin ESP32-DEVKITC / ESP32-WROOM-32 based board
  • Relay control remapped to IO23 on the 38-pin controller interface
  • 90 x 70 mm layout checked for fit with the new controller footprint and onboard USB edge access
  • U2 replacement re-validated against the photographed 38-pin ESP32 board family, preserving EXT_5V, 3V3, GND, IO23, IO21, and IO22 connections
Photographed board reference orientation
  • USB connector at the bottom
  • Critical preserved functional mapping used by this project:
    • GPIO23 -> relay control
    • GPIO22 -> INA219 SCL
    • GPIO21 -> INA219 SDA
    • 3V3 -> INA219 supply and I2C pull-ups
    • 5V -> dev-board external power input
    • GND -> common logic and power reference
Open questions
  • Select final buck implementation for prototype versus module strategy if desired
  • Decide whether any auxiliary debug header adds value beyond the dev board USB connection

    Design Summary

    Scope

    System context

    Requirements

    Functional

    Electrical

    Mechanical / environmental

    Key constraints

    Dependencies and risks

    Validation

    Release-facing notes

    Change notes / open questions

Documents

    Project Specification

    Design Notes

Assets

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

12-24 -> esp controller thumbnail
Golf ball dispenser controller with protected 12V-24V DC input, LM2596 5V buck, ESP32 control, INA219 relay-coil sensing, and dry-contact relay output.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$6.05–$9.43

Digi-Key

$25.76–$27.71

LCSC

$5.21–$5.33

Mouser

$13.71–$13.77

TME

$9.98

Verical

$4.32–$8.32

Controls