ISAC Beacon (Upgraded Version)

This project is a modern, enhanced version of the original ISAC Beacon, designed to provide both short-range Bluetooth connectivity and long-range LoRa mesh communication using Meshtastic. It integrates advanced environmental sensors, NeoPixel visual feedback, and audio playback in a modular, solder-free design for accessibility and expandability.

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📦 Features

• Bluetooth Low Energy (BLE) for real-time communication with smartphones.
• LoRa (Meshtastic) support for encrypted long-range messaging and location sharing.
• Environmental Sensing:
  • Full-spectrum UV (A, B, C) detection.
  • Ambient light level.
  • Temperature, humidity, and CO₂ concentration.
  • Air quality / particulate matter (PM1.0, PM2.5, PM10).
• Audio feedback via plug-and-play STEMMA QT speaker.
• Visual feedback with NeoPixel ring.
• Accessible, solder-free design using Qwiic/STEMMA QT connectors for sensors and audio.

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🧠 Hardware Used

Microcontrollers & Communication

• Adafruit ESP32 Feather V2 w.FL Antenna - 8MB Flash + 2 MB PSRAM - STEMMA QT – BLE, Wi-Fi, STEMMA QT/Qwiic ready.
• TTGO T-Beam v1.1 / v1.2 – LoRa mesh communication with GPS, running Meshtastic firmware.

Sensors (All Qwiic/STEMMA QT)

• SparkFun Spectral UV Sensor - AS7331 – Full-spectrum UV (A/B/C).
• Adafruit BH1750 Light Sensor – Ambient light.
• Adafruit SCD-40 CO₂ Sensor – CO₂, temperature, humidity.
• Adafruit PMSA003I Air Quality Sensor – Air quality particulate sensing (PM1.0/PM2.5/PM10).

I²C Multiplexer (optional):

• Adafruit PCA9548 8-Channel STEMMA QT / Qwiic Multiplexer – To avoid address conflicts if needed.

Audio & Visual

• Adafruit STEMMA Speaker with built-in amplifier (Plug-and-play JST PH 2mm connection).
• Adafruit NeoPixel 16x RGB LED Ring.

User Inputs

• Two tactile push buttons for user interaction.

Power

• 3.7V LiPo Battery (1200–2000mAh).
• USB-C Cable.

Cabling

• STEMMA QT / Qwiic JST SH 4-Pin Cables for sensor daisy-chaining.

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📐 System Architecture

[ UV | Light | CO₂ | Air Quality ]
             ↓
 [ Feather ESP32 V2 ]
         ↙    ↓     ↘
  BLE ↔ Phone    NeoPixel   Speaker
             ↓
   Serial UART → TTGO T-Beam → LoRa Mesh

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###🔋 Powering the System All devices powered by a shared 3.7V LiPo battery.

Feather charges via USB-C.

T-Beam can either share the same battery (via JST splitter) or be powered separately.

###🔧 Software Stack

• Feather ESP32 V2:
  • Arduino code for BLE communication.
  • I²C sensor polling.
  • NeoPixel and button control.
  • Serial communication with T-Beam. -T-Beam: -Meshtastic firmware for LoRa messaging and location sharing.

###🛠 Plug-and-Play Chain All sensors connected via STEMMA QT/Qwiic cables — no soldering required. Sensors can be daisy-chained directly. Multiplexer (optional) only needed if I²C address conflicts arise with additional sensors.

###📲 Coming Soon Finalized Arduino code for Feather ESP32 V2. Updated wiring diagrams and pin assignments. 3D printable case design optimized for the new hardware. Printable plug-and-play setup guide for assembly.

###🧩 License Open hardware and firmware under MIT license. Fork, remix, and improve freely.

###🙏 Acknowledgments Inspired by the original ISAC Beacon project by WedgeTheJedi, with adaptations for modern hardware, accessibility, and real-world mesh communication.

###✅ Key Benefits No soldering required for all sensors and speaker. BLE + LoRa dual communication. Full environmental sensing including rare UV-C measurement. Expandable for future sensors or peripherals.