Based on your uploaded project concept, here is the complete implementation structure for the Adaptive Self-Healing LoRa-Based Emergency Communication Network for Disaster Management. The system uses ESP32 + LoRa disaster-sensing nodes, relay nodes, and an emergency control receiver.
1. Complete Project Units
Unit 1: Disaster Sensing / Transmitter Node
Function: Detect disaster conditions and transmit emergency data.
Components:
- ESP32
- SX1278 LoRa
- MPU6050 vibration/earthquake sensor
- Capacitive soil moisture sensor
- BME280
- Rain sensor
- Water-level sensor
- NEO-6M GPS
- OLED display
- SOS push button
- Buzzer and LED
- Battery supply
Working:
- ESP32 reads all sensors.
- Sensor values are compared with threshold values.
- GPS location is collected.
- If danger is detected, an emergency priority is assigned.
- ESP32 creates a data packet.
- LoRa transmits the packet to the nearest available node.
Example packet:
SRC:NODE1|TYPE:EMERGENCY|VIB:HIGH|SOIL:85|WATER:70|LAT:17.3850|LON:78.4867|HOP:0
2. Unit 2: LoRa Relay / Self-Healing Node
Components:
- ESP32
- SX1278 LoRa
- OLED optional
- Green/red LED
- Buzzer optional
Working
The relay node:
- Receives the LoRa packet.
- Checks the packet ID to avoid duplicate forwarding.
- Checks whether the destination/control center is reachable.
- Forwards the packet to the next available route.
- Increases the hop count.
- If one route/node fails, forwards through another active relay.
Self-healing example
Normal: NODE 1 → RELAY 1 → RELAY 2 → CONTROL CENTER If RELAY 1 fails: NODE 1 → RELAY 3 → RELAY 2 → CONTROL CENTER
This multi-hop alternate-path concept is the main innovation of the project.
Relay Node Software Logic
loop() { checkIncomingLoRa(); if(packetReceived) { if(packetNotPreviouslyReceived) { savePacketID(); if(nextRouteAvailable) { forwardPacket(); } else { selectAlternateRoute(); forwardPacket(); } } } sendHeartbeat(); checkNeighbourStatus(); }
3. Unit 3: Emergency Control Receiver
Components:
- ESP32
- SX1278 LoRa
- 16×2 LCD or OLED
- Red LED
- Green LED
- Buzzer
- Laptop/PC connection
Working
- Receiver continuously listens for LoRa packets.
- Receives disaster/emergency information.
- Displays node ID and emergency status.
- Activates red LED and buzzer for high-priority alerts.
- Sends the information to the PC dashboard through Wi-Fi/Serial/local network.
- Stores/display node status and routing information.
The receiver/control architecture in your project includes monitoring node status, emergency alerts, locations, and routing paths.
4. Unit 4: PC Emergency Monitoring Dashboard
The dashboard can display:
--------------------------------------------- EMERGENCY COMMUNICATION CONTROL CENTER --------------------------------------------- NODE ID : NODE_01 STATUS : EMERGENCY VIBRATION : HIGH SOIL MOISTURE : 85 % WATER LEVEL : 72 % TEMPERATURE : 31.5 C LOCATION : GPS AVAILABLE ROUTE : N1 → R3 → R2 → CONTROL HOP COUNT : 3 LAST UPDATE : ACTIVE ---------------------------------------------
Dashboard functions
- Node online/offline status
- Sensor monitoring
- Emergency messages
- GPS location
- Route visualization
- Relay node status
- Packet/hop information
- Emergency priority
5. Complete Step-by-Step Implementation
Step 1: First Test ESP32
Install ESP32 board support in Arduino IDE and upload a basic Blink program.
Step 2: Test SX1278 LoRa
Connect ESP32 and SX1278 using SPI.
Example wiring
| SX1278 | ESP32 |
|---|---|
| VCC | 3.3V |
| GND | GND |
| SCK | GPIO 18 |
| MISO | GPIO 19 |
| MOSI | GPIO 23 |
| NSS | GPIO 5 |
| RST | GPIO 14 |
| DIO0 | GPIO 26 |
Important: SX1278 must use 3.3V, not 5V.
Step 3: Test LoRa Transmitter and Receiver
First send a simple message:
HELLO FROM NODE 1
Then verify it at the receiver.
Step 4: Add MPU6050
Use the MPU6050 to measure:
- Acceleration X
- Acceleration Y
- Acceleration Z
If vibration exceeds the selected threshold:
EARTHQUAKE ALERT
is generated.
Step 5: Add Soil Moisture Sensor
Read the analog value and convert it to percentage.
Possible use:
High soil moisture → Landslide risk indication
Step 6: Add Water-Level Sensor
Use it for flood detection.
Water level > threshold → FLOOD ALERT
Step 7: Add BME280
Measure:
- Temperature
- Humidity
- Atmospheric pressure
Step 8: Add GPS
GPS provides:
Latitude Longitude
The location is attached to every emergency packet.
Step 9: Add SOS Button
When pressed:
MANUAL SOS ALERT
is immediately transmitted with high priority.
Step 10: Combine All Sensors
ESP32 reads all sensor values and creates one structured packet.
NODE1,EMERGENCY,32.5,78,85,60,17.XXXX,78.XXXX
Step 11: Implement Relay Nodes
Build at least 2 relay nodes for a convincing demonstration.
Recommended prototype:
Sensor Node A ──┐ ├── Relay Node 1 ── Receiver Sensor Node B ──┘ │ X Failure Alternative: Sensor Node A → Relay Node 2 → Receiver
Step 12: Add Heartbeat Monitoring
Every node periodically sends:
NODE1,HEARTBEAT
If a heartbeat is not received for a specified time, the node is considered unavailable.
if(millis() - lastHeartbeat > TIMEOUT) { nodeStatus = OFFLINE; selectAlternateRoute(); }
Step 13: Test Self-Healing
- Start all nodes.
- Send an emergency message.
- Confirm the normal route.
- Switch OFF one relay node.
- Send another emergency message.
- Demonstrate that another relay forwards the message.
This directly demonstrates the project's adaptive/self-healing functionality.
6. Software Code Structure
I recommend creating separate software for each unit.
Software 1
Disaster_Sensor_Node.ino
Read Sensors ↓ Check Thresholds ↓ Get GPS ↓ Generate Alert ↓ Create LoRa Packet ↓ Transmit
Software 2
LoRa_Relay_Node.ino
Receive Packet ↓ Check Packet ID ↓ Check Route ↓ Select Best Route ↓ Alternate Route if Required ↓ Forward Packet
Software 3
Emergency_Receiver.ino
Receive LoRa Data ↓ Decode Packet ↓ Display Information ↓ Emergency Alarm ↓ Send to Dashboard
Software 4
PC Dashboard
Receive ESP32 Data ↓ Update Node Status ↓ Display Sensor Data ↓ Show Emergency Message ↓ Display Route Information
7. Basic Transmitter ESP32 Software
#include <SPI.h> #include <LoRa.h> #define LORA_SS 5 #define LORA_RST 14 #define LORA_DIO0 26 #define SOIL_PIN 34 #define WATER_PIN 35 #define SOS_PIN 27 #define BUZZER 25 #define RED_LED 2 String nodeID = "NODE1"; void setup() { Serial.begin(115200); pinMode(SOS_PIN, INPUT_PULLUP); pinMode(BUZZER, OUTPUT); pinMode(RED_LED, OUTPUT); SPI.begin(18, 19, 23, 5); LoRa.setPins(LORA_SS, LORA_RST, LORA_DIO0); if (!LoRa.begin(433E6)) { Serial.println("LoRa initialization failed!"); while (1); } Serial.println("Disaster Sensor Node Started"); } void loop() { int soilValue = analogRead(SOIL_PIN); int waterValue = analogRead(WATER_PIN); bool sos = digitalRead(SOS_PIN) == LOW; String status = "NORMAL"; if (soilValue > 2500) status = "LANDSLIDE_RISK"; if (waterValue > 2000) status = "FLOOD_ALERT"; if (sos) status = "SOS_EMERGENCY"; if (status != "NORMAL") { digitalWrite(RED_LED, HIGH); digitalWrite(BUZZER, HIGH); } else { digitalWrite(RED_LED, LOW); digitalWrite(BUZZER, LOW); } String packet = "SRC=" + nodeID + "|TYPE=" + status + "|SOIL=" + String(soilValue) + "|WATER=" + String(waterValue) + "|HOP=0"; LoRa.beginPacket(); LoRa.print(packet); LoRa.endPacket(); Serial.println(packet); delay(5000); }
8. Basic Relay Node Software
#include <SPI.h> #include <LoRa.h> #define LORA_SS 5 #define LORA_RST 14 #define LORA_DIO0 26 String relayID = "RELAY1"; void setup() { Serial.begin(115200); SPI.begin(18, 19, 23, 5); LoRa.setPins(LORA_SS, LORA_RST, LORA_DIO0); if (!LoRa.begin(433E6)) { while (1); } Serial.println("Relay Node Started"); } void loop() { int packetSize = LoRa.parsePacket(); if (packetSize) { String received = ""; while (LoRa.available()) { received += (char)LoRa.read(); } Serial.println("Received: " + received); received += "|VIA=" + relayID; delay(200); LoRa.beginPacket(); LoRa.print(received); LoRa.endPacket(); Serial.println("Forwarded: " + received); } }
9. Basic Receiver Software
#include <SPI.h> #include <LoRa.h> #define LORA_SS 5 #define LORA_RST 14 #define LORA_DIO0 26 #define RED_LED 2 #define GREEN_LED 4 #define BUZZER 25 void setup() { Serial.begin(115200); pinMode(RED_LED, OUTPUT); pinMode(GREEN_LED, OUTPUT); pinMode(BUZZER, OUTPUT); SPI.begin(18, 19, 23, 5); LoRa.setPins(LORA_SS, LORA_RST, LORA_DIO0); if (!LoRa.begin(433E6)) { while (1); } Serial.println("Emergency Receiver Started"); } void loop() { int packetSize = LoRa.parsePacket(); if (packetSize) { String message = ""; while (LoRa.available()) { message += (char)LoRa.read(); } Serial.println(message); if (message.indexOf("EMERGENCY") >= 0 || message.indexOf("ALERT") >= 0 || message.indexOf("RISK") >= 0) { digitalWrite(RED_LED, HIGH); digitalWrite(GREEN_LED, LOW); digitalWrite(BUZZER, HIGH); delay(1000); digitalWrite(BUZZER, LOW); } else { digitalWrite(RED_LED, LOW); digitalWrite(GREEN_LED, HIGH); } } }
Recommended Final Prototype
For the best final-year demonstration:
┌──────────────────┐ │ SENSOR NODE 1 │ │ ESP32 + Sensors │ └────────┬─────────┘ │ LoRa │ ┌────────▼─────────┐ │ RELAY NODE 1 │ │ ESP32 + LoRa │ └────────┬─────────┘ │ Normal Route │ ┌────────▼─────────┐ │ CONTROL RECEIVER │ └──────────────────┘ Alternative / Self-Healing Route ┌──────────────────┐ │ RELAY NODE 2 │ │ ESP32 + LoRa │ └──────────────────┘
Next development stage: the basic code above should be upgraded into a complete integrated system with MPU6050 + BME280 + GPS + water level + soil sensor, packet IDs, duplicate prevention, heartbeat monitoring, route tables, acknowledgements, and actual alternate-route selection. This matches the uploaded project's intended ESP32/LoRa sensing, multi-hop routing, and emergency-control architecture.
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