#include "Arduino.h"
#include <Wire.h>
#define BLYNK_TEMPLATE_ID "TMPL6KotIH9Cj"
#define BLYNK_TEMPLATE_NAME "wk10"
#define BLYNK_AUTH_TOKEN "HW-wLZyBX-qZhAqqzgj6sWjL5-RxW2-0"
#define trigPin 11
#define echoPin 12
#define trig_Pin 7
#define echo_Pin 8
 
#include <SPI.h>
#include <WiFiNINA.h>
#include <BlynkSimpleWiFiNINA.h>
#include <DHT.h>// include adafruit library unified sensor
#define DHTPIN A0 //
#define DHTTYPE DHT22  
const int CO2Pin = A0;
 
DHT dht = DHT(DHTPIN, DHTTYPE);
BlynkTimer timer;
char ssid[] = "DGEM1234";
char pass[] = "dgem4321";
 
#define BLYNK_PRINT Serial
 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); 


int counter = 0;
int counter2 = 0;
int currentState = 0;
int previousState = 0;

float readcounter();
 
void setup()
{
Serial.begin (9600);
 pinMode(trigPin, OUTPUT);
 pinMode(echoPin, INPUT);
 pinMode(trig_Pin, OUTPUT);
 pinMode(echo_Pin, INPUT);

lcd.init(); // initialize the lcd
lcd.backlight();

Serial.begin(9600); // baude rate is 9600
dht.begin();

  Blynk.virtualWrite(V0, t);
  Blynk.virtualWrite(V1, h);

Serial.println("Connection complete");

delay(1000);
}


void setup()
{
  Serial.begin(115200);
  dht.begin(); // Setup sensor:
  timer.setInterval (1000L,sensor);
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  Serial.println("Setup starting...");
  Serial.println("Set UP Complete");
  pinMode(ledPin, OUTPUT);

  }
 
void loop()
{
float readCO =analogRead (COPin) ; 
Serial.println(readCO);
delay (1000);

lcd.backlight(); // Turn on the LCD backlight  
lcd.setCursor(0, 0);
lcd.print( "Number of people:  ");
lcd.print(counter);
lcd.print(" Person");

 long duration, distance;
 long duration2, distance2;

 //for sensor1
 digitalWrite(trigPin, LOW); 
 delayMicroseconds(2); 
 digitalWrite(trigPin, HIGH);
 delayMicroseconds(10); 
 digitalWrite(trigPin, LOW);

//for sensor2
  digitalWrite(trig_Pin, LOW); 
 delayMicroseconds(2); 
 digitalWrite(trig_Pin, HIGH);
 delayMicroseconds(10); 
 digitalWrite(trig_Pin, LOW);

 duration = pulseIn(echoPin, HIGH);
 distance = (duration/2) / 29.1;

duration2 = pulseIn(echo_Pin, HIGH);
 distance2 = (duration/2) / 29.1;

//instead of parenthesis () put angle bracket as YouTube description does not allow angle bracket
 if (distance <= 10){ 
 currentState = 1;
 }
 else {
 currentState = 0;
 }
 delay(100);
 if(currentState != previousState){
if(currentState == 1){
counter = counter + 1;
Serial.println(counter);
}
}

if (distance2 <= 10){ 
 counter2 = counter - 1;
 }
 else {
 currentState = previousState;
 }

 delay(100);
Serial.println(counter2);

delay(2000); // Wait a few seconds between measurements:
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old'

float h = dht.readHumidity();// Read the humidity in %:
float t = dht.readTemperature(); // Read the temperature as Celsius:

Blynk.run();
timer.run();
}