// LEDs and PIR sensors
int PIR1 = 23;
int PIR2 = 22;
int PIR3 = 21;
int PIR4 = 19;
int PIR5 = 18;
int LED1 = 13;
int LED2 = 12;
int LED3 = 14;
int LED4 = 15;
int LED5 = 2;
int LED6 = 4;
int LED7 = 5;
int LDR = 27;

// LDR Characteristics
const float GAMMA = 0.7;
const float RL10 = 50;

void setup()
{
  Serial.begin(115200);
  Serial.println("Smart Street Lighting System");
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);
  pinMode(LED5, OUTPUT);
  pinMode(LED6, OUTPUT);
  pinMode(LED7, OUTPUT);
  pinMode(PIR1, INPUT);
  pinMode(PIR2, INPUT);
  pinMode(PIR3, INPUT);
  pinMode(PIR4, INPUT);
  pinMode(PIR5, INPUT);
  pinMode(LDR, INPUT);
}

void loop()
{

  int LDRValue = analogRead(LDR);
  float voltage = LDRValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  Serial.print("LDR Sensor = ");
  Serial.println(lux);
  delay(500);

  int motion1 = digitalRead(PIR1);

  int motion2 = digitalRead(PIR2);

  int motion3 = digitalRead(PIR3);

  int motion4 = digitalRead(PIR4);

  int motion5 = digitalRead(PIR5);

  if (lux > 100)
  {
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, LOW);
    digitalWrite(LED4, LOW);
    digitalWrite(LED5, LOW);
    digitalWrite(LED6, LOW);
    digitalWrite(LED7, LOW);
    Serial.println("It's Bright Outside; Lights status: OFF");
  }

  else {
    if (motion5 == HIGH)
    {
      digitalWrite(LED1, HIGH);
      digitalWrite(LED2, HIGH);
      digitalWrite(LED3, HIGH);
      Serial.println("It's Dark Outside; Motion detected at PIR1");
      delay(500);
    }

    if (motion4 == HIGH)
    {
      digitalWrite(LED2, HIGH);
      digitalWrite(LED3, HIGH);
      digitalWrite(LED4, HIGH);
      Serial.println("It's Dark Outside; Motion detected at PIR2");
      delay(500);
    }

    if (motion3 == HIGH)
    {
      digitalWrite(LED3, HIGH);
      digitalWrite(LED4, HIGH);
      digitalWrite(LED5, HIGH);
      Serial.println("It's Dark Outside; Motion detected at PIR3");
      delay(500);
    }

    if (motion2 == HIGH)
    {
      digitalWrite(LED4, HIGH);
      digitalWrite(LED5, HIGH);
      digitalWrite(LED6, HIGH);
      Serial.println("It's Dark Outside; Motion detected at PIR4");
      delay(500);
    }
      
    if (motion1 == HIGH)
    {
      digitalWrite(LED5, HIGH);
      digitalWrite(LED6, HIGH);
      digitalWrite(LED7, HIGH);
      Serial.println("It's Dark Outside; Motion detected at PIR5");
      delay(500);
    }
    
    else if (motion1 == LOW && motion2 == LOW && motion3 == LOW && motion4 == LOW && motion5 == LOW){
      digitalWrite(LED1, LOW);
      digitalWrite(LED2, LOW);
      digitalWrite(LED3, LOW);
      digitalWrite(LED4, LOW);
      digitalWrite(LED5, LOW);
      digitalWrite(LED6, LOW);
      digitalWrite(LED7, LOW);
      Serial.println("It's Dark Outside; No Motion detected");
    }
  }
}