/**********Intrusion Detection******/
#define echo 2
#define trig 3
#define outA 8 // Red LED
#define outB 9 // Green LED
#define outC 10 // Buzzer
float duration; // time taken by the pulse to return back float
distance; // one way distance travelled by the pulse
const int intruderDistance = 10; /* the minimum distance up to which thesensor is able to
sense any object */
void setup()
{
pinMode(trig, OUTPUT);
pinMode(echo, INPUT);
pinMode(outA, OUTPUT);
digitalWrite(outA, LOW);
pinMode(outB, OUTPUT);
digitalWrite(outB, LOW);
pinMode(outC, OUTPUT);
digitalWrite(outC, LOW);
Serial.begin(9600);
 }
void loop()
{
time_Measure
ment();
distance = (float)duration * (0.0343) / 2;
// calculate the one way distance travelled by the pulse
Serial.println(distance);
alarm_condition();
}
void time_Measurement()
{
// function to measure the time taken by the pulse to return back
digitalWrite(trig, LOW);
delayMicroseconds(2);
digitalWrite(trig,
HIGH);
delayMicroseconds(10)
; digitalWrite(trig,
LOW); duration =
pulseIn(echo, HIGH);
}
void alarm_condition()
{
//function to execute the output commands based on the sensor
input
if(distance<=intruderDistance)
{
digitalWrite(outA,HIGH);
digitalWrite(outB,LOW);
analogWrite(outC,200);
 }
else
{
digitalWrite(outA,LOW);
digitalWrite (outB, HIGH);
analogWrite (outC,0);
 }
}