Project 2 - Measuring the distance of an object using ultrasonic sensor and also smoothen the sensor data using moving average filter

Code:

//Slave

#include  

int sig = 2;   //Assigning pin2 as sig for readabilty

int duration, inches, cm; 

static int avg;   

void setup()

{

Serial.begin(9600);

Wire.begin(8);   

Wire.onRequest(distance); 

}

void loop()

{

delay(50);

}

void distance()    

{

pinMode(sig, OUTPUT);   

digitalWrite(sig, LOW); 

delay(5);

digitalWrite(sig, HIGH);

delay(10);

digitalWrite(sig, LOW);

pinMode(sig, INPUT);                  //Declaring pin2 as input

duration = pulseIn(sig, HIGH);    //To read the pulse

cm = 0.01723 * duration;;    //converting time into a distance

Wire.write(cm);                     //Return value to master

delay(5);

}

// C++ code

//MASTER

#include    

#include              

LiquidCrystal lcd(2,3,4,5,6,7);    //pins connected to LCD

int distance;        //variable to print the data from slave

void setup()

{

Serial.begin(9600);

Wire.begin();         //To begin I2C communication

lcd.begin(16,2);     //To begin LCD display

lcd.clear();

}

void loop()

{

Wire.requestFrom(8,4);      // 8 is address 4 byte

distance=Wire.read();    

lcd.setCursor(0,0);     

lcd.print(distance);    

lcd.print(" cm");  

delay(50);       

Wire.end();    

}