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

PROJECT - 2

CODE:

int trigPin = 2; // initialize Trigger pin
int echoPin = 4; // initialize Echo pin
long duration, cm, inches; //declare the variables
long sum=0;
long avg;
int i;

void setup() // one time run the loop

{
Serial.begin (9600); //used for serial monitor perpose
pinMode(trigPin, OUTPUT); // 2nd pin set as output pin
pinMode(echoPin, INPUT); //4th pin set as a input pin
}

void loop() // infinite time run the loop

{
// The sensor is triggered by a HIGH pulse of 10 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
digitalWrite(trigPin, LOW);
delayMicroseconds(5);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

// Read the signal from the sensor: a HIGH pulse whose
// duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
pinMode(echoPin, INPUT);
duration = pulseIn(echoPin, HIGH);

// Convert the time into a distance

cm = (duration/2) / 29.1; // Divide by 29.1 or multiply by 0.0343
inches = (duration/2) / 74; // Divide by 74 or multiply by 0.0135
for (i=0; i<5; i++) //used for iteration
{
sum=sum+inches;
avg = sum/5;
}
Serial.print(avg); //print the avg value in the console
Serial.print("Avg, ");
Serial.print(cm); //print the cm value in the console
Serial.print("cm");
Serial.println();
Serial.print(inches); //print the inches value in the console
Serial.print("in");
Serial.println();

delay(1000);
}