Smart light

arduino_code.ino

#include <SoftwareSerial.h>

// Pin configuration
const int ldrPin = A0;            // Pin for the LDR detecting flickering
const int dayNightLdrPin = A1;    // Pin for the LDR detecting day/night
const int vibrationPin = 2;       // Pin for the vibration sensor
const int currentSensorPin = A2;  // Pin for the current sensor
const int relayPin = 3;           // Pin for the relay to control the lamp

// Sensor variables
float thresholdCurrent = 0.1;     // Current threshold (in Amperes)
int ldrThreshold = 700;           // Threshold for flickering (adjust as needed)
int dayNightThreshold = 300;      // LDR value threshold to determine day/night
int flickerCount = 0;             // Counter for LDR changes
const int flickerThreshold = 10;  // Number of changes to detect flickering
unsigned long lastFlickerCheck = 0;
const unsigned long flickerCheckInterval = 1000;  // Check interval in milliseconds

// Alert flags
volatile bool vibrationDetected = false;
volatile bool currentProblemDetected = false;
volatile bool flickeringDetected = false;
bool isNight = false;

// GSM and GPS module configuration
SoftwareSerial sim800l(7, 8);  // RX, TX for GSM module
SoftwareSerial gps(4, 3);      // RX, TX for GPS module

void setup() {
  Serial.begin(9600);
  sim800l.begin(9600);
  gps.begin(9600);

  Serial.println("Initializing...");
  delay(1000);

  Serial.println("Checking...");
  delay(1000);

  sim800l.println("AT");  //Once the handshake test is successful, it will back to OK
  updateSerial();

  pinMode(vibrationPin, INPUT);
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW);                                                     // Ensure the relay is off initially
  attachInterrupt(digitalPinToInterrupt(vibrationPin), detectVibration, FALLING);  // when vibration goes from high to low then there is a vibration
}

void loop() {
  // Read the ambient light level
  int dayNightValue = analogRead(dayNightLdrPin);
  isNight = dayNightValue < dayNightThreshold;

  // Only run detection logic if it's night
  if (isNight) {
    // Read current
    float current = readCurrent();
    if (current < thresholdCurrent) {
      if (!currentProblemDetected) {
        currentProblemDetected = true;
        Serial.println("Problem detected: Low current");
      }
    } else {
      currentProblemDetected = false;
    }

    // Read LDR for flickering detection
    int ldrValue = analogRead(ldrPin);
    if (ldrValue > ldrThreshold) {
      flickerCount++;
    }

    // Check flickering every second
    if (millis() - lastFlickerCheck >= flickerCheckInterval) {
      lastFlickerCheck = millis();
      if (flickerCount >= flickerThreshold) {
        flickeringDetected = true;
        Serial.println("Flickering detected");
        sendSMS("Flickering detected");
      }
      flickerCount = 0;  // Reset the counter
    }

    // Read GPS and send coordinates if a problem is detected
    if (Serial.available()) {
      String gpsData = readGPS();
      if (gpsData.length() > 0) {
        if (vibrationDetected || currentProblemDetected || flickeringDetected) {
          sendSMS("GPS Coordinates: " + gpsData);
        }
      }
    }

    // Send SMS based on flags
    if (currentProblemDetected) {
      sendSMS("Problem detected: Low current");
    }

    if (flickeringDetected) {
      flickeringDetected = false;  // Reset after sending SMS
    }

    if (vibrationDetected) {
      sendSMS("Vibration detected!");
      vibrationDetected = false;  // Reset after sending SMS
    }
  } else {
    // Turn off the relay if it's day
    digitalWrite(relayPin, LOW);
  }

  delay(1000);  // Wait 1 second before the next read
}

// Function to read current
float readCurrent() {
  int sensorValue = analogRead(currentSensorPin);
  float voltage = sensorValue * (5.0 / 1023.0);
  float current = (voltage - 2.5) / 0.185;  // ACS712 sensitivity 185mV/A
  return current;
}

// Function to detect vibrations
void detectVibration() {
  vibrationDetected = true;
}

// Function to send an SMS
void sendSMS(String message) {
  sim800l.println("AT+CMGF=1");  // Set SMS mode to text
  delay(1000);
  sim800l.println("AT+CMGS=\"+1234567890\"");  // Replace with your phone number
  delay(1000);
  sim800l.println(message);  // SMS content
  delay(1000);
  sim800l.write(26);  // End of SMS character
  updateSerial();
  delay(1000);
  Serial.println("SMS sent: " + message);
}

// Function to read GPS data
String readGPS() {
  String gpsData = "";
  while (gps.available()) {
    char c = gps.read();
    gpsData += c;
    if (c == '\n') {
      break;
    }
  }
  return gpsData;
}

void updateSerial() {
  delay(500);
  while (Serial.available()) {
    sim800l.write(Serial.read());  //Forward what Serial received to Software Serial Port
  }
  while (sim800l.available()) {
    Serial.write(sim800l.read());  //Forward what Software Serial received to Serial Port
  }
}