#include <LiquidCrystal_I2C.h>

#define echoPin 32
#define trigPin 33
#define motionPin 27
#define ledPin 25
#define LCD_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2



long duration;
int distance;
int motionSignal;




LiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLUMNS, LCD_ROWS);
void ultrasonic() {
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
    duration = pulseIn(echoPin, HIGH);
    distance = duration * 0.034 / 2; 

    
    delay(500); 
}


void motion() {

motionSignal=digitalRead(motionPin);

}




void setup() {
    Serial.begin(9600);
    pinMode(trigPin, OUTPUT); 
    pinMode(echoPin, INPUT); 
    pinMode(motionPin, INPUT);
    pinMode(ledPin, OUTPUT);
    lcd.begin(16,2);
    lcd.init();
    lcd.backlight();
    delay(2000); 
}

void loop() {
    
    ultrasonic();
    motion();
  
    if(distance>=90 && motionSignal==HIGH)
    {
      Serial.println("child");
      lcd.setCursor(1,0);
      lcd.print("Distance :");
      lcd.setCursor(11,0);
      lcd.print("   ");
      lcd.setCursor(11,0);
      lcd.print(distance);
      lcd.setCursor(14,0);
      lcd.print("cm");
      lcd.setCursor(5,1);
      lcd.print("child");
      digitalWrite(ledPin, HIGH);
      delay(1000);
    }
  
    else if(distance>=90)
    {
      Serial.println("child");
      lcd.setCursor(1,0);
      lcd.print("Distance :");
      lcd.setCursor(11,0);
      lcd.print("   ");
      lcd.setCursor(11,0);
      lcd.print(distance);
      lcd.setCursor(14,0);
      lcd.print("cm");
      lcd.setCursor(5,1);
      lcd.print("child");
      digitalWrite(ledPin, HIGH);
      delay(1000);
    }
   
   else
   {
       Serial.println("adult");
      lcd.setCursor(1,0);
      lcd.print("Distance :");
      lcd.setCursor(11,0);
      lcd.print("   ");
      lcd.setCursor(11,0);
      lcd.print(distance);
      lcd.setCursor(14,0);
      lcd.print("cm");
      lcd.setCursor(5,1);
      lcd.print("Adult");
      digitalWrite(ledPin, LOW);
      delay(1000);
   }
}

// made by Rashi,Sidharth,&