maincode

/* iCAS: Infant Car Alert System                                                /
/  This is a program which runs on the Arduino Uno and additional sensors       /
/  to create a device which prevents heat stroke deaths of children in vehicles /                                                                  /
/                                                        Rashi Ranjan          */
//Powered by the Arduino, GSM is attached on top of the Arduino.

#include <SoftwareSerial.h> //GSM Identification

SoftwareSerial SIM900(7, 8);

//Temperature Sensor connected to power, ground and Analog output 

#include <dht.h> 

#define dht_dpin A0 //Analog output is given to Arduino

float carTemp;

dht myTempSensor;

int dopplerValue = 0; // output of Doppler sensor

void setup() 
{
 pinMode(A3,INPUT);
 //pinMode(6, OUTPUT); //Buzzer's Output Pin
 Serial.begin(9600); // sets up serial monitor communication at 9600 bits/sec
 SIM900.begin(19200); // sets up GSM communication at 19200 bits/sec
 SIM900power(); // powering up GSM shield
 delay(30000);  // give time to log on to network 
}

void loop() 
{
  dopplerValue = analogRead(A3);
  myTempSensor.read11(dht_dpin); // reading the temperature
  carTemp = (myTempSensor.temperature*9/5) + 32;
  Serial.println(carTemp);
  Serial.println (dopplerValue);
  
  if (carTemp > 82)
  { 
    if (dopplerValue)
    {
      Serial.println("Alarm activated...");    
      beep(500); 
      Serial.println("Dangerous temperature: Sending SMS message");    
      sendSMS();
      // sendSMS2();
      Serial.println("Sending SMS message DONE");
      delay(180000);
    }
    else
    {
      loop;
    }
  }
  else
  {
    Serial.println("Baby is safe right now.");
    delay (5000);
  }
}
void SIM900power()
// software equivalent of pressing the GSM shield "power" button
{
 digitalWrite(9, HIGH);
 delay(1000);
 digitalWrite(9, LOW);
 delay(5000);
}
void sendSMS()
{
  // SIM900 communication code borrowed from
 // http://www.geeetech.com/wiki/index.php/Arduino_GPRS_Shield
 SIM900.print("AT+CMGF=1\r"); // AT command to send SMS message
 delay(100);
 SIM900.println("AT + CMGS = \"+14084256398\"");  // recipient's mobile number
 delay(100);
  // message to send
 SIM900.println("iCAS ALERT: A Child has been left in the car alone. Please rescue quickly!"); 
 delay(100);
 SIM900.println((char)26);  
 delay(100); 
 SIM900.println();
 delay(5000);               // give module time to send SMS
 SIM900power();             // turn off module
}
void beep(unsigned char delayms){
  analogWrite(6, 200);      // Almost any value can be used except 0 and 255 - experiment to get the best tone
  delay(delayms);          // wait for a delayms ms
  analogWrite(6, 0);       // 0 turns it off
  delay(delayms);          // wait for a delayms ms   
}