HV Trigger Async (ESP32 / ESP32-S3)

Firmware for ESP32 boards hosting a minimal web UI to safely arm and trigger a high‑voltage initiator. AsyncTCP + ESPAsyncWebServer power a WebSocket control channel; configuration persists via Preferences.

Features

• SoftAP: Trigger-Remote / lollipop, IP 10.11.12.1.
• Inline UI from PROGMEM; no filesystem required.
• WebSocket at /ws for telemetry (~250 ms) and commands.
• Pulse controls: mode single or buzz, width, spacing, repeat.
• Hardware LEDs: amber/green (network/WS), red (armed), blue (pulse).
• Status bar: WS and Armed LEDs, mode label (BUZZ/SINGLE‑SHOT), compact W/S/R values (e.g., 31/38/3), AP name; reconnect overlay while WS is down.
• OTA via ArduinoOTA (TCP/3232) — update while the app is running.
• Verbose Serial logs for boot, prefs, HTTP, WS, and actions.

Quickstart

1. Dependencies: ESP32 core (recommended 2.0.14), libraries in library-notes.txt.
2. Build & Burn scripts (recommended):
   • Windows: buildAndBurn.ps1 (or buildAndBurn.bat wrapper)
   • macOS/Linux: chmod +x buildAndBurn.sh && ./buildAndBurn.sh Scripts prompt for sketch, FQBN, clean, port selection, upload, and can open a serial monitor.
3. Manual (Arduino IDE):
   • ESP32 Dev Module (ESP32‑WROOM‑32): select Board "ESP32 Dev Module".
   • ESP32‑S3 Dev Module: select Board "ESP32S3 Dev Module" and enable USB CDC on boot. Then open hv_trigger_async.ino and Upload.
4. Connect to AP Trigger-Remote and open http://10.11.12.1/.
5. OTA Update (optional):
   • Ensure your PC and the device are on the same network (AP or STA).
   • Arduino IDE: use the Network Port entry if available.
   • Arduino CLI: arduino-cli upload -p 10.11.12.1:3232 --fqbn esp32:esp32:esp32 hv_trigger_async.ino (replace FQBN for ESP32‑S3).

Controls & Ranges

• Mode: single or buzz.
• Width: 5–100 ms; Spacing: 10–100 ms; Repeat: 1–4.
• Arm/Disarm gates firing; cfg changes are ignored while armed.

Build & Tools

• Scripts: see above. CLI fallback in README.build.md.
• Serial monitor: arduino-cli monitor -p COMX -c baudrate=115200.
• WebSocket test (PowerShell): powershell -ExecutionPolicy Bypass -File tools\\test_ws.ps1

API Reference

See docs/WS_API.md for WebSocket message formats, examples, and flows.

Code Map

• hv_trigger_async.ino: setup/loop, telemetry tick, indicators.
• web_server.cpp/.h: AP setup, async server, WebSocket, inline UI, actions.
• config.h: pins, SoftAP settings, defaults; edit pins here if needed.

Hardware

• KiCad project resides in hardware_kicad/ (schematics *.kicad_sch, board *.kicad_pcb).
• Generated artifacts (plots, fabrication outputs, iBOM) are currently included from prototyping; going forward we’ll prefer attaching these to GitHub releases rather than committing bulk outputs.
• For fabrication, open in KiCad 7/8 and regenerate plots/GERBER/Drill files as needed. Additional notes may be present in hardware_kicad/.

Safety

Change the default SoftAP password before field use. Treat the trigger output as live hardware — validate with a dummy load first.

Release v1.21a

• Prototype hardware integrated and tested with the firmware.
• Repo/docs tidy-up; encoding fixes and clearer setup notes.
• Tag: v1.21a marks the working prototype snapshot.