Arduino Code and Diagram Review
Wire J1 to U1 VIN and GND, place it at the board edge, route, and run final DRC.
Thought for 5 sec
I’ll wire J1 to VIN/GND, move it to the board edge for access, then attempt routing and run final checks.
Worked for 9 mins 46 sec
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:
- Ask me to do a DRC cleanup pass on the routed traces.
- If cleanup is stubborn, re-place U1/U2/DS1 with more spacing and re-route.
- After DRC is clean, export Gerbers/BOM for manufacturing.
Clean DRC and export
Fix DRC errors
Re-place and reroute
Export after clean
Review current risks
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Ask about this doc
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
| Function | ESP32 GPIO | Net / target |
|---|---|---|
| 74HC595 SER/DS | GPIO23 | SR_DATA |
| 74HC595 SRCLK/SHCP | GPIO18 | SR_CLOCK |
| 74HC595 RCLK/STCP | GPIO5 | SR_LATCH |
| Digit 1 common cathode | GPIO13 | DIG1 |
| Digit 2 common cathode | GPIO12 | DIG2 |
| Digit 3 common cathode | GPIO14 | DIG3 |
| Digit 4 common cathode | GPIO27 | DIG4 |
| +1 button | GPIO32 | BTN_UP |
| -1 button | GPIO33 | BTN_DOWN |
| Reset button | GPIO25 | BTN_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
