mg_tank_level_monitor

An upgraded Liquid Level Monitor for the Raspberry Pi Pico W. This is a complete rewrite of the original tank_level_monitor, migrating from a custom LWIP/Pico SDK stack to the Mongoose networking library for a more robust and modern IoT experience.

🚀 Key Improvements

• Networking Stack: Now powered by Mongoose, providing a stable HTTP/WebSocket server and MQTT Client.
• Frontend: Replaced static HTML with a reactive Preact Single Page Application (SPA) powered by Vite.
• Server Build: The frontend is bundled into web_root folder, the server build process then packs the files in packed_fs.c for the C server.

🛠 Project Structure

• /Server: The C-based backend. Handles ADC readings, MQTT publishing, and the Mongoose web server.
• /Webapp: The Preact + JavaScript frontend source code.

🔌 Hardware Requirements

• Microcontroller: Raspberry Pi Pico W.
• Sensor: 4-20mA pressure transducer (0-5m range).
• Interface: 4-20mA to 0-3.3V converter connected to GPIO26 (ADC0).
• Reset Button: Connected to GPIO13 (long press to reset configurations).

📦 Getting Started

1. Build the Frontend

Navigate to the Webapp folder to install dependencies and bundle the UI:

cd Webapp
npm install
npm run build

### 2. Build the Server
Using VSCode with the Raspberry Pi Pico Project extension