Monitor temperature & humidity from up to 3 remote locations over LoRa 433 MHz with Reed-Solomon error correction, visualized on a real-time web dashboard.
Each sensor node reads a DHT22 and transmits over LoRa in its own time slot. The ESP32 gateway receives every packet, corrects errors with Reed-Solomon FEC, and forwards clean JSON to a FastAPI server over UDP. The server validates the data and serves it through a live dashboard.
Node 1 ─┐ LoRa 433MHz ┌──────────┐ WiFi/UDP ┌─────────────┐
Node 2 ─┼───────────────▶ │ Gateway │──────────────▶│ FastAPI │──▶ 🌐 Dashboard
Node 3 ─┘ │ (RS-FEC) │ │ server.py │
└──────────┘ └─────────────┘
| Wiring | Hardware build | Dashboard |
|---|---|---|
 |
 |
 |
lora-sentinel/
├── firmware/
│ ├── gateway/gateway_esp32.ino # LoRa RX → RS decode → UDP forward
│ └── node/node_sensor.ino # DHT22 read → RS encode → LoRa TX
├── server
│ └──server.py # FastAPI server + dashboard
├── docs/ # Wiring & hardware photos
├── requirements.txt
├── README.md
├── .gitignore
└── LICENSE
- ESP32 dev board ×4 (1 gateway + up to 3 nodes)
- LoRa module 433 MHz (e.g. RA-02 / SX1278) ×4
- DHT22 sensor, 1 per node (data pin → GPIO 4)
- LoRa wiring: SCK→18, MISO→19, MOSI→23, NSS→5, RST→14, DIO0→26 (see
docs/wiring-diagram-gateway.png)
Install Arduino libraries: LoRa (Sandeep Mistry), DHT sensor library + Adafruit Unified Sensor, RS-FEC.
- Nodes (
firmware/node/node_sensor.ino): set a uniqueNODE_ID(1–3) per board, then upload. - Gateway (
firmware/gateway/gateway_esp32.ino): set your WiFi credentials and the server's IP, then upload.
LoRa & Reed-Solomon parameters must be identical across the gateway and all nodes.
python -m venv .venv
.venv\Scripts\Activate.ps1
pip install -r requirements.txt
python server/server.pyOpen http://localhost:8000 for the dashboard. UDP data is received on port 5005.
See the LICENSE file for details.
- Yunachz — GitHub