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

Project: In this project the implementation of code for “Measuring distance of an object using ultrasonic distance sensor (28015 Ping) and also smoothen the sensor data using moving average filter”.

#define trigPin 9 // Define the pin9 for the triggering_pin of ultrasonic sensor

#define echoPin 10 // Define the pin9 for the triggering_pin of ultrasonic sensor

#define numSamples 10 // Define the number of samples for the moving average filter

int samples[numSamples]; // Define an array to hold the samples

int currentSample = 0; // Define a variable to hold the index of the current sample

void setup() {

Serial.begin(9600); // Initialize serial communication

pinMode(trigPin, OUTPUT); // Set the trigger pin as an output

pinMode(echoPin, INPUT); // Set the echo pin as an input

}

void loop() {

// Send a pulse to the ultrasonic sensor to trigger a measurement

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

// Measure the duration of the echo pulse and calculate the distance in centimeters

float duration = pulseIn(echoPin, HIGH);

float distance = duration * 0.034 / 2;

// Add the current sample to the array and increment the index

samples[currentSample] = distance;

currentSample++;

// Wrap around the index if it exceeds the number of samples

if (currentSample >= numSamples) {

currentSample = 0;

}

// Calculate the moving average of the samples

float sum = 0;

for (int i = 0; i < numSamples; i++) {

sum += samples[i];

}

float averageDistance = sum / numSamples;

// Print the raw and smoothed distances

Serial.print("Raw distance: ");

Serial.print(distance);

Serial.print(" cm, ");

Serial.print("Smoothed distance: ");

Serial.print(averageDistance);

Serial.println(" cm");

// Wait for a short delay before taking the next measurement

delay(50);

}