Interfacing of Multiple Ultrasonic Sensors (3 HC-SR04 ) With Arduino

Interfacing of Multiple Ultrasonic Sensors (3 HC-SR04 ) With Arduino

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Block diagram:

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HC-SR04 ULTRASONIC SENSOR:

SCHEMATIC DIAGRAM:

FINAL SOFTWARE CODE:

----------------------------------------

#include <LiquidCrystal.h>

LiquidCrystal lcd(8,9,10,11,12,13);

#define trigPin1 A0

#define echoPin1 A1

#define trigPin2 A2

#define echoPin2 A3

#define trigPin3 A4

#define echoPin3 A5

int ALARM = 7;

long duration, distance, FIRSTSensor,SECONDSensor,THIRDSensor;

void setup()

{

lcd.begin(16,2);

Serial.begin (9600);

lcd.clear(); 

pinMode(trigPin1, OUTPUT);

pinMode(echoPin1, INPUT);

pinMode(trigPin2, OUTPUT);

pinMode(echoPin2, INPUT);

pinMode(trigPin3, OUTPUT);

pinMode(echoPin3, INPUT);

pinMode(ALARM, OUTPUT);

digitalWrite(ALARM, LOW);

 lcd.setCursor(0,0);lcd.print("Interfacing ");

lcd.setCursor(0,1);lcd.print("of Multiple ");

delay(3000);lcd.clear();  

lcd.setCursor(0,0);lcd.print("3 HC - SR04 ");

lcd.setCursor(0,1);lcd.print("Ultrasonic  ");

delay(3000);lcd.clear();

lcd.setCursor(0,0);lcd.print("SensorS With ");

lcd.setCursor(0,1);lcd.print("Arduino ");

delay(3000);lcd.clear();

}

void loop() 

{

/////////////////////////////////////////////////////// 

SonarSensor(trigPin1, echoPin1);

FIRSTSensor = distance;

SonarSensor(trigPin2, echoPin2);

SECONDSensor = distance;

SonarSensor(trigPin3, echoPin3);

THIRDSensor = distance;

/////////////////////////////////////////////////////////////

digitalWrite(ALARM, LOW);

//////////////////////////////////////////////////////////////////////////////////////

Serial.print("S1:");Serial.println(FIRSTSensor); delayMicroseconds(10);

Serial.print("S2:");Serial.println(SECONDSensor);delayMicroseconds(10);

Serial.print("S3:");Serial.println(THIRDSensor); delayMicroseconds(10);

///////////////////////////////////////////////////////////////////////////////////////

lcd.setCursor(0,0);lcd.print("S1:");lcd.setCursor(4,0);lcd.print(FIRSTSensor);

lcd.setCursor(9,0);lcd.print("S2:");lcd.setCursor(12,0);lcd.print(SECONDSensor);

lcd.setCursor(0,1);lcd.print("S3:");lcd.setCursor(4,1);lcd.print(THIRDSensor);

delay(1000);lcd.clear();

///////////////////////////////////////////////////////

if((FIRSTSensor >= 10) & (FIRSTSensor <= 50)) 

{digitalWrite(ALARM, HIGH);delay(500);}

///////////////////////////////////////////////////////

if((SECONDSensor >= 10) & (SECONDSensor <= 50)) 

{digitalWrite(ALARM, HIGH);delay(500);}

///////////////////////////////////////////////////////

if((THIRDSensor >= 10) & (THIRDSensor <= 50)) 

{digitalWrite(ALARM, HIGH);delay(500);}

///////////////////////////////////////////////////////

}

/////////////////////////////////////////////////////////////////////////////////

void SonarSensor(int trigPin,int echoPin)

{

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance = (duration/2) / 29.1;

}

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