Published December 15, 2016

Temperature Sensitive Burglary Alarm

A device that senses temperature in the area and tells the user if anyone enters the room and their distance from an object.

BeginnerShowcase (no instructions)1 hour601

Things used in this project

Hardware components

PIR Motion Sensor (generic)

Buzzer

LED (generic)

Temperature Sensor

Ultrasonic Sensor

Story

PIR Sensor and Ultrasonic Sensor are connected together to detect any movement and to calculate distance of the thing that is causing the movement. LED and Buzzer are connected to one of digital output ports of Arduino Board to provide blinking output after detecting the motion.

The motion detected by the PIR sensor will be sent as information to the LED, buzzer and ultrasonic and temperature sensors

LED and Buzzer - go on HIGH mode.

Ultrasonic Sensor - calculates distance of nearest obstacle.

Temperature Sensor - calculates the temperature in the the area

If the temperature goes greater or lower than a particular temperature range, the LED and buzzer will go on HIGH mode with a higher frequency and will display the message: “Beware! Temperature is exceeding the safe range!”

Temperature Sensative Alarm

const int trigPin = 7;
const int echoPin =10;
long duration;
int distance;
int ledPin = 13;                
int inputPin = 2;              
int pirState = LOW;             
int val = 0;   
float temp;
int tempPin = 0;
float f;
void setup() {
Serial.begin(9600);
pinMode(13, OUTPUT);     
pinMode(inputPin, INPUT);     
Serial.begin(9600);
pinMode(trigPin,OUTPUT);
pinMode(echoPin,INPUT);
Serial.begin(9600);
pinMode(12,OUTPUT);  
}
void loop(){
temp=analogRead(tempPin);
temp=temp*0.48828125;
f=temp*9/5+32;
digitalWrite(trigPin,LOW);
delayMicroseconds(2);
digitalWrite(trigPin,HIGH);
digitalWrite(trigPin,LOW);
duration=pulseIn(echoPin,HIGH);
distance=duration*0.034/2;
val = digitalRead(inputPin);  
 if (val == HIGH) {            
 digitalWrite(ledPin, HIGH); 
 if (pirState == LOW) {
 Serial.println("Motion detected!");
 Serial.print("Temperature= “);
Serial.print(temp);
Serial.print("*C and ");
Serial.print(f);
Serial.print("*f");
Serial.println();
delay(1000);
Serial.print("Someone is at a distace of ");
Serial.println(distance);
pirState = HIGH;
if((temp>=35)||(temp<=25))
{digitalWrite(ledPin, HIGH);
delayMicreoseconds(20);
Serial.print(“ Beware ! Temperature is exceeding the safe range”);}
else
{Serial.print(“HURRY UP”);
}}}
 else {
    digitalWrite(ledPin, LOW); 
    if (pirState == HIGH)
{Serial.println("Motion ended!");
  pirState = LOW;
    }}}