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Writer's pictureAKSHIT'S INNOVATION LAB

CODE AND CIRCUIT DIAGRAM FOR CAR PARKING ALARM


//AKSHIT INNOVATION LAB


int buzPin = 7; //declare pin for Buzzer;

int trigPin = 8; //declare pin for trigger pin of UltraSonic sensor;

int echoPin = 4; //declare pin for echo pin of UltraSonic sensor;

float speed = 0.0347; //declare speed of sound in air @ room temp;

float dist; //declare variable for containing distance sensed;

float pingTime; //declare variable for containing echo time;

int buzNear = 20; //declare buzzing time for very close proximity;

int buzHigh = 50; //declare buzzing time for close proximity;

int buzMid =130; //declare buzzing time for mid proximity;

int buzFar = 600; //declare buzzing time for far off object;

int delayFar = 260;



void setup() {

pinMode(buzPin,OUTPUT); //set buzzer & trigger pin as outpin;

pinMode(trigPin,OUTPUT);

pinMode(echoPin,INPUT); //set echo pin as input;


}


void loop() {

digitalWrite(trigPin,LOW);

delayMicroseconds(20);

digitalWrite(trigPin,HIGH);

delayMicroseconds(10);

digitalWrite(trigPin,LOW); //creating a pulse for sensing distance;

pingTime = pulseIn(echoPin,HIGH); //read the echoTime, &hence the distance;

dist = (speed*pingTime*0.5);

if(dist<=10.0){

digitalWrite(buzPin,HIGH); //simple conditional statements changing frequency based upon the distance sensed

delay(20);

digitalWrite(buzPin,LOW);

delay(20);

}

else if(dist<=30.0 && dist>10.0)

{

digitalWrite(buzPin,HIGH);

delay(buzHigh);

digitalWrite(buzPin,LOW);

delay(buzHigh);

}

else if((dist>30.0) && (dist<60.0))

{

digitalWrite(buzPin,HIGH);

delay(buzMid);

digitalWrite(buzPin,LOW);

delay(buzMid);

}

else if(dist>=60.0 && dist<120.0)

{

digitalWrite(buzPin,HIGH);

delay(buzFar);

digitalWrite(buzPin,LOW);

delay(delayFar);

}

}

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