Real-Time Flood Alert & Monitoring System

Real-Time Flood Alert & Monitoring System

Code:

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

#include <SoftwareSerial.h>

#define TRIG_PIN 7

#define ECHO_PIN 6

#define BUZZER 9

#define GREEN_LED 10

#define RED_LED 11

SoftwareSerial sim800l(2, 3); // SIM800L TX to D2, RX to D3

LiquidCrystal_I2C lcd(0x27, 16, 2);

int maxWaterLevel = 11; // Set a threshold in centimeters

void setup() {

    Serial.begin(9600); // Initialize Serial Monitor

    pinMode(TRIG_PIN, OUTPUT);

    pinMode(ECHO_PIN, INPUT);

    pinMode(BUZZER, OUTPUT);

    pinMode(GREEN_LED, OUTPUT);

    pinMode(RED_LED, OUTPUT);

    digitalWrite(BUZZER, LOW);

    digitalWrite(GREEN_LED, LOW);

    digitalWrite(RED_LED, LOW);

    lcd.init();

    lcd.backlight();

    sim800l.begin(9600);

    Serial.println("Flood Monitoring System Initialized...");

    lcd.setCursor(0, 0);

    lcd.print("Flood Monitor");

    lcd.setCursor(0, 1);

    lcd.print("System with GSM");

    delay(5000);

}

float measureWaterLevel() {

    digitalWrite(TRIG_PIN, LOW);

    delayMicroseconds(2);

    digitalWrite(TRIG_PIN, HIGH);

    delayMicroseconds(10);

    digitalWrite(TRIG_PIN, LOW);

    long duration = pulseIn(ECHO_PIN, HIGH);

    float distance = (duration * 0.0343) / 2; // Convert to cm

    Serial.print("Measured Water Level: ");

    Serial.print(distance);

    Serial.println(" Meters");

    return distance;

}

void sendSMSAlert(float level) {

    Serial.println("Sending SMS Alert...");

    sim800l.println("AT+CMGF=1"); // Set SMS mode

    delay(1000);

    sim800l.println("AT+CMGS=\"+919392268126\""); // Replace with control room number

    delay(1000);

    sim800l.print("???? Flood Alert! Water level critical: ");

    sim800l.print(level);

    sim800l.println(" Meters");

    delay(1000);

    sim800l.write(26); // End SMS

    Serial.println("✅ SMS Sent!");

}

void loop() {

    float waterLevel = measureWaterLevel();

    lcd.clear();

    lcd.setCursor(0, 0);

    lcd.print("Water Level: ");

    lcd.setCursor(0, 1);

    lcd.print(waterLevel);

    lcd.print(" Meters");

    if (waterLevel >= maxWaterLevel) { // Safe water level

        digitalWrite(GREEN_LED, HIGH);

        digitalWrite(RED_LED, LOW);

        digitalWrite(BUZZER, LOW);

        Serial.println("✅ Status: Safe Water Level");

    } else { // Low water level = Flood Alert!

        digitalWrite(GREEN_LED, LOW);

        digitalWrite(RED_LED, HIGH);

        digitalWrite(BUZZER, HIGH);

        Serial.println("⚠️ WARNING: Low Water Level Detected!");

        sendSMSAlert(waterLevel);

        delay(10000); // Avoid repeated SMS alerts in a short time

    }

    delay(2000);

}