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

Schematic Diagram:

code:

int trigPin = 11;

int echoPin = 12;

long duration, cm, inches;

long sum=0;

long avg;

int i;

void setup()

{

Serial.begin (9600);

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 = pulseIn(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);

}

output: