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

code:

int trigpin=11; //Trigger

int echopin=12; //Echo

long duration,cm,inches;

long sum=0;

long avg;

int i;

void setup()

{

// Serial port begin

Serial begin(9600);

// define inputs and outputs

pinMode(trigPin, OUTPUT);

pinMode(echoPin,INPUT);

}

void loop()

{

digitalWrite(trigPin, LOW);

delayMicroseconds(5);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, Low);

pinMode(echoPin, INPUT);

duration=pulseln(echoPin,HIGH);

cm=(duration/2)/29.1;

inches=(duration/2)/74;

for(i=0; i<5; i++)

{

sum=sum+inches;

avg=sum/5;

}

Serial.print(avg);

Serial.print("Avg");

Serial.print(cm);

Serial.print("cm");

Serial.println();

Serial.print(inches);

Serial.print("in");

Serial.println();

delay(250);

}

Circuit diagram