#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;
unsigned long previousMillis4=0;
unsigned long previousMillis5=0;
unsigned long previousMillis6=0;
unsigned long previousMillis7=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 STATE 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);
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");
  if (SMSRequest()){
      if (currentMillis1 - previousMillis2 >= wait)
      {
      // REPLACE THE X's WITH THE RECIPIENT'S MOBILE NUMBER
      // USE INTERNATIONAL FORMAT CODE FOR MOBILE NUMBERS

      // REPLACE WITH YOUR OWN SMS MESSAGE CONTENT

       at("AT",1000);
  at("AT+CMGF=1",1000);
  at("AT+CSCS=\"GSM\"",1000);
  at("AT+CMGS=\"" + SDT+"\"",2000);

  at("so nguoi rua tay",1000);
  SIM900.write((char)26);
  SIM900.print("AT+CMGD=1,4");
  SIM900.print("AT+CNMI=2,2,0,0,0\r");
  previousMillis2 = currentMillis1;  // Remember the time
  }
  }


  delay(10);

}


boolean SMSRequest() {
    unsigned long currentMillis2 = millis();
      unsigned long currentMillis3 = millis();
        unsigned long currentMillis4 = millis();
        unsigned long currentMillis5 = millis();
    unsigned long currentMillis6 = millis();



  if(SIM900.available() >0) {
    incomingChar=SIM900.read();
    if(incomingChar=='S') {
    if (currentMillis2 - previousMillis3 >= wait)
    {
       previousMillis3 = currentMillis2;
      Serial.print(incomingChar);
      incomingChar=SIM900.read();
      if(incomingChar =='T') {
        if (currentMillis3 - previousMillis4 >= wait)
        {
        Serial.print(incomingChar);
        incomingChar=SIM900.read();
         previousMillis4 = currentMillis3;

        if(incomingChar=='A') {
          if (currentMillis4 - previousMillis5 >= wait)
          {
          Serial.print(incomingChar);
          incomingChar=SIM900.read();
          previousMillis5 = currentMillis4;

          if(incomingChar=='T') {

             if (currentMillis5 - previousMillis6 >= wait)
            {
            Serial.print(incomingChar);
            incomingChar=SIM900.read();
             previousMillis6 = currentMillis5;

            if(incomingChar=='E') {
               if (currentMillis6 - previousMillis7 >= wait)
              {
             Serial.print(incomingChar);
              Serial.print("...Request Received \n");
              return true;
              previousMillis7 = currentMillis6;

            }
          }
        }
      }
    }
  }
  }
  }
  }
  }
  }

  return false;
}
void at(String _atcm,unsigned long _dl){
  SIM900.print(_atcm+"\r\n");
  delay(_dl);
}