#include <LiquidCrystal.h>
LiquidCrystal lcd(13,12,11,10,9,8);
#include <DHT.h>
DHT dht(4,DHT22);


void setup() {
  // put your setup code here, to run once:
  lcd.begin(20,4);
  dht.begin();
  pinMode(A0, INPUT);     //LDR
  pinMode(7, INPUT);      //PIR
  pinMode(5, INPUT);      //ECHO
  pinMode(6, INPUT);      //trigger
  pinMode(3, OUTPUT);     //buzzer
  pinMode(2,OUTPUT);      //LED
}
void loop() {
  // put your main code here, to run repeatedly:
  
  int ldr=analogRead(A0);
  int pir=digitalRead(7);
  
  float dhtH=dht.readHumidity();
  float dhtTemp=dht.readTemperature();
  float dhtT = dht.readTemperature(true);

  lcd.setCursor(0,0);
  lcd.print("L:");
  lcd.setCursor(2,0);
  lcd.print(ldr);
  lcd.setCursor(6,0);
  lcd.print("P:");
  lcd.setCursor(8,0);
  lcd.print(pir);



  lcd.setCursor(0,1);
  lcd.print("H:");
  lcd.setCursor(2,1);
  lcd.print(dhtH);
  lcd.setCursor(8,1);
  lcd.print("T:");
  lcd.setCursor(10,1);
  lcd.print(dhtT);

  digitalWrite(6, LOW);
  delayMicroseconds(25);
  digitalWrite(6, HIGH);
  delayMicroseconds(10);
  digitalWrite(6, LOW);
  int duration = pulseIn(5, HIGH);
  int us=duration * 0.034 / 2;
  lcd.setCursor(12,0);
  lcd.print("U:");
  lcd.setCursor(15,0);
  lcd.print(us);
 
  if(ldr<=300 && pir==HIGH || ldr>=700 && pir==HIGH){
    digitalWrite(2, HIGH);
    delay(2000);
    digitalWrite(2, LOW);
  }
  delay(2000);
 // lcd.clear();
 
  if(us<200)
  {
    digitalWrite(3, HIGH);
    delay(2000);
    digitalWrite(3, LOW);
  }
  delay(2000);
   
  if(dhtH<=30 && dhtT<=50 || dhtH>=50 && dhtT>=80)
  {
    digitalWrite(3, HIGH);
    delay(2000);
    digitalWrite(3, LOW);
  }
}