Arduino Uno R3 temperature sensor + buzzer sample code. Read more here: http://alif.my/2013/10/project-2-temperature-sensor-buzzer/

temperatureSensor

float temp;
int tempPin = 0;
int buzzer=8; //Connect the buzz positive Pin to Digital Pin 8 

void setup()
{
  pinMode(buzzer,OUTPUT); //Set Pin Mode as output
  Serial.begin(9600);
  beep(500);
  
}

void loop()
{
  //digitalWrite(buzzer,LOW);
  
  temp = analogRead(tempPin);
  temp = temp * 0.48828125;
  
  if(temp > 35) { beep(50); beep(50); }
  
  Serial.print("TEMPRATURE = ");
  Serial.print(temp);
  Serial.print(" Celcius");
  Serial.println();
  delay(1000);
}

void beep(unsigned char delayms){
  digitalWrite(buzzer,HIGH);
  delay(delayms);          // wait for a delayms ms
  digitalWrite(buzzer,LOW);
  delay(delayms);          // wait for a delayms ms   
}  

Sir i have this code and working properly but now i want add buzzer to alert if temperature increase
suppose if (temperature > 50) then buzzer beep
please help me

#include<LiquidCrystal.h>
LiquidCrystal lcd(2,4,7,8,9,10);

const int Sensor = A0;
byte degree_symbol[8] =
{
0b00111,
0b00101,
0b00111,
0b00000,
0b00000,
0b00000,
0b00000,
0b00000
};
void setup()
{
pinMode(Sensor, INPUT);
lcd.begin(16,2);
lcd.createChar(1, degree_symbol);
lcd.setCursor(0,0);
lcd.print(" Digital ");
lcd.setCursor(0,1);
lcd.print(" Thermometer ");
delay(4000);
lcd.clear();
}
void loop()
{

 float temp_reading=analogRead(Sensor);
 float temperature=temp_reading*(5.0/1023.0)*100;
 delay(10); 

lcd.clear();
lcd.setCursor(0,0);
lcd.print("Temperature in C");
lcd.setCursor(4,1);
lcd.print(temperature);
lcd.write(1);
lcd.print("C");
delay(1000);

}

How can i make this code interact with Matlab? I know I can create a GUI but i am not sure what is the KEY word or code to make this happen