Arduino Code and Diagram Review

flux

I added the requested through-hole VIN/GND connector: J1 = 2-pin 5.08 mm screw terminal (DB127V-5.08-2P-GN-S) for an external regulated 5 V input to the ESP32 DevKit VIN.
Open items:
  • J1 is not wired yet to U1 VIN and GND.
  • J1 is not placed on the PCB yet.
  • PCB routing and final DRC/ERC checks are still pending.
  • I’m blocked because the account has no available ACUs, so AI execution tools are unavailable right now.
Suggested next steps:
  1. Add ACUs, then ask me to continue from “wire J1, place it, route, and run final DRC.”
  2. Use USB-only power instead if you don’t want the VIN connector wired.
  3. After routing, run final DRC/ERC and then export Gerbers/BOM.
B

bjoern2004

Wire J1 to U1 VIN and GND, place it at the board edge, route, and run final DRC.

flux

I’ll wire J1 to VIN/GND, move it to the board edge for access, then attempt routing and run final checks.

flux

Wired J1 pin 1 → VIN and J1 pin 2 → GND, placed J1 at the lower-left board edge, and ran the auto-router successfully; the route check now reports nothing left to route.
Open items:
  • ERC is clean.
  • DRC is not clean: it still reports route-geometry issues — airwire/trace, dangling-trace, and overlapping-copper errors — even though the router says all nets are routed.
  • The board should not be sent to fabrication until those DRC route errors are resolved.
Suggested next steps:
  1. Ask me to do a DRC cleanup pass on the routed traces.
  2. If cleanup is stubborn, re-place U1/U2/DS1 with more spacing and re-route.
  3. After DRC is clean, export Gerbers/BOM for manufacturing.
Clean DRC and export
Fix DRC errors
Re-place and reroute
Export after clean
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Files

Schematic

Layout

3D View

Schematic is Auto-placed

The schematic has been arranged automatically. Flux can redraw it to be more readable, with components placed in related groups and wires drawn more legibly. This takes about 10-60 mins.

ESP32 7-Segment Counter Design Notes
Source files
  • sketch_v3.ino: ESP32 Arduino firmware for a 0-9999 counter.
  • diagram_v3.json: Wokwi wiring diagram.
Implemented circuit
  • ESP32 DevKit V1 30-pin GPIO13 variant, custom part created because the exact Wokwi 30-pin DevKit was not available in the Flux library and the closest 40-pin module lacked GPIO12/13/14.
  • CD74HC595 shift register at U2.
  • 5461AS four-digit common-cathode 7-segment display at DS1.
  • R1-R8: 220 Ω segment current limiting resistors for A/B/C/D/E/F/G/DP.
  • SW1/SW2/SW3: +1, -1, and reset pushbuttons to GPIO32/GPIO33/GPIO25, active-low with ESP32 internal pull-ups.
  • C1: 100 nF local decoupling for U2.
Pin mapping

Table

FunctionESP32 GPIONet / target
74HC595 SER/DSGPIO23SR_DATA
74HC595 SRCLK/SHCPGPIO18SR_CLOCK
74HC595 RCLK/STCPGPIO5SR_LATCH
Digit 1 common cathodeGPIO13DIG1
Digit 2 common cathodeGPIO12DIG2
Digit 3 common cathodeGPIO14DIG3
Digit 4 common cathodeGPIO27DIG4
+1 buttonGPIO32BTN_UP
-1 buttonGPIO33BTN_DOWN
Reset buttonGPIO25BTN_RESET
Important hardware caveats
  • The Wokwi design directly drives the 5461AS digit common cathodes from ESP32 GPIO pins. On real hardware this can exceed recommended GPIO sink current when several segments are on. A production-quality revision should add four low-side digit driver transistors and invert/update the digit-enable logic in firmware.
  • GPIO12 is an ESP32 boot strapping pin. Because it is connected to a display digit common, verify the display circuit does not force an invalid boot state.
  • The custom ESP32 DevKit footprint uses public nominal 30-pin DevKit geometry; measure the exact module before fabrication if mechanical fit is critical.

  • Source files

  • Implemented circuit

  • Pin mapping

  • Important hardware caveats