#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);  
SoftwareSerial sim(2,13); //here 2-tx,13-rx for modem

const int Threshold = 65;
String number = "0679255630";
#define buzzer A3

void setup() 
{ 
  Serial.begin(9600);
  Serial.println("system initialize");
  pinMode(buzzer,OUTPUT);
  pinMode(4,OUTPUT);
  digitalWrite(buzzer,LOW);
  digitalWrite(4,LOW);
  lcd.init();
  lcd.backlight();
  welcomeDisplay();
  sim.begin(9600);
  delay(1000);
  digitalWrite(4,HIGH);
}

void loop() 
{
  home_display();
  for(uint8_t i=0;i<3;i++)
  {
    if(scanfinger(i) > Threshold)
    {
      Buzzer(i+1);
      alert_Display(i);
      SendMessage(i);
    }
  }
  delay(500);
}

void Buzzer(uint8_t num)
{
  for(uint8_t j=0;j<num;j++)
  {
    digitalWrite(buzzer,HIGH);
    delay(500);
    digitalWrite(buzzer,LOW);
    delay(250);
  }
}


uint8_t scanfinger(uint8_t num) 
{
  unsigned int reading = map(analogRead(num),0,1023,0,100);
  Serial.print("reading:");
  Serial.print(num);
  Serial.print(" is:");
  Serial.println(reading);
  return reading;
} 

void SendMessage(uint8_t num)
{
  sim.println("AT+CMGF=1\r");
  delay(100);
  sim.println("AT+CMGS=\"" + number + "\"\r");
  delay(500);
  if(num==0){sim.println("I NEED FOOD");}
  else if(num==1) {sim.println("I NEED TO GO TOILET");}
  else if(num==2) {sim.println("I FEEL PAIN");}
  delay(500);
  sim.println((char)26);
  delay(500);
  Serial.println("SMS SENT SUCCESSFULLY");
}

void welcomeDisplay()
{
     lcd.clear();
     lcd.setCursor(0,0);
     lcd.print("PARTIENT DEMAND"); 
     lcd.setCursor(0,1);
     lcd.print("   MONITORING   "); 
     delay(3000);
     lcd.clear();
     lcd.setCursor(0,0);
     lcd.print("INITIALIZING SYS");
     lcd.setCursor(0,1);
     lcd.print("PLEASE WAIT ....");
}

void home_display()
{
     lcd.clear();
     lcd.setCursor(0,0);
     lcd.print("PARTIENT DEMAND"); 
     lcd.setCursor(0,1);
     lcd.print("   MONITORING   "); 
}

void alert_Display(uint8_t num)
 {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print(">>> !ALERT! <<<<");
    lcd.setCursor(0,1);
    if(num==0){lcd.print("I NEED FOOD");}
    if(num==1){lcd.print("I NEED TOILET");}
    if(num==2){lcd.print("I FEEL PAIN");}
 }