//Include Software Serial library to communicate with GSM
#include <SoftwareSerial.h>

// Pin DHT is connected to


// Configure software serial port
SoftwareSerial SIM900(10,11);

// Create variable to store incoming SMS characters
char incomingChar;
String SDT="0901344386";
const int sensor = 52;
int count=0;
int sensorstate=0;
int lastsensorstate=0;
int simstate =0;
char msg;
int xuat;
 #include <LCD.h>
#include <LiquidCrystal.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4 ,5 ,6, 7, 3, POSITIVE);
unsigned long previousMillis1=0;
unsigned long previousMillis2=0;
unsigned long previousMillis3=0;
long interval = 1000;
// interval at which to blink (milliseconds)

long wait = 10;
long tgian = 500;
void setup() {

  Serial.begin(9600);
  SIM900.begin(9600);

  // Give time to your GSM shield log on to network
  delay(2000);
  Serial.print("SIM900 ready...");

  // AT command to set SIM900 to SMS mode
  SIM900.print("AT+CMGF=1\r");
  delay(100);
  // Set module to send SMS data to serial out upon receipt
  SIM900.print("AT+CNMI=2,2,0,0,0\r");
  delay(100);
  at("AT",1000);
  at("AT+CMGF=1",1000);
  at("AT+CSCS=\"GSM\"",1000);
  at("AT+CMGS=\"" + SDT+"\"",2000);
   at("nhan phim 1 de xem so nguoi rua tay",1000);
  SIM900.write(26);
  SIM900.print("AT+CMGD=1,4");
  SIM900.print("AT+CNMI=2,2,0,0,0\r");
  delay(100);// ctlrZ
  Serial.begin(9600);
  Serial.println("ok");
  lcd.begin(16,2);
  lcd.backlight();
  lcd.setCursor(0,0);

   lcd.print("so nguoi");


}

void loop(){
 unsigned long currentMillis = millis();
 unsigned long currentMillis1 = millis();


sensorstate=digitalRead(sensor);
//đếm số
if (sensorstate!=lastsensorstate){
    if (sensorstate==HIGH){
      count++;
      Serial.println("dang chay");
     Serial.println(count);
      lcd.setCursor(0,1);
      lcd.print(count);
      if (currentMillis - previousMillis1 >= tgian)
      {
      Serial.print("1");
      int num=count;
    }
    }
    else{
      Serial.println("off");
    }
}
lastsensorstate=sensorstate;
String xuat =String(count);
SIM900.println("AT+CNMI=2,2,0,0,0");
noInterrupts();
//nhắn báo số người
  if (SMSRequest()){



    at("AT",1000);
    at("AT+CMGF=1",1000);    //Sets the GSM Module in Text Mode  // Delay of 1000 milli seconds or 1 second

    at("AT+CSCS=\"GSM\"",1000);
    at("AT+CMGS=\"" + SDT+"\"",2000); // Replace x with mobile number
    at("so nguoi:",1000);// The SMS text you want to send
    at(xuat,100);
    SIM900.println((char)26);// ASCII code of CTRL+Z

    Serial.print("2");

  }
interrupts();

  }

  // put your main code here, to run repeatedly:


boolean SMSRequest() {
  unsigned long currentMillis1 = millis;
  //chờ tin nhắn tới
  if(SIM900.available() >0) {
    incomingChar=SIM900.read();
    if((incomingChar==1)&&(currentMillis1 - previousMillis3 >= wait)) {

      Serial.print(incomingChar);
      incomingChar=SIM900.read();
      previousMillis3=currentMillis1;
}
  }
}
void at(String _atcm,unsigned long _dl){
  SIM900.print(_atcm+"\r\n");
  delay(_dl);
}