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

1.

Overview of the 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”.

Goals:

• Measuring the distance in terms of inches of an object using Ultrasonic Distance Sensor (28015 Ping).
• The sensor data is smoothened by using Moving average filter technique to eliminate the high frequency variations from the sensor data.

Key Highlights of the Project:

• Measuring the distance travelled by the wave to the object and gets bounced back from the object to sensor.
• Smoothening the sensor data by moving average filter technique, the filter has a window of certain size. That window determines that how many data the filter can take.

Deliverables of this project:

• The distance travelled by a wave to the object for which we want to measure the distance using Ultrasonic Distance Sensor (28015 Ping).
• Eliminate the high frequency jitters from the sensor data by Moving Average filter to smoothen the sensor data.

Expected Outcomes:

The students will get the Knowledge on Ultrasonic sensor (28015 Ping) to measure the distance travelled by wave to the object, the hardware connection of 2 Arduino’s connected to the sensor and smoothening the sensor data by removing high frequency variations using Moving Average Filter Technique.

const int windowSize = 10; 
int trigPin = 7; 
int echoPin = 8; 
int sensorValue; 
int sensorReadings[windowSize]; 
int sensorIndex = 0; 
int sensorTotal = 0; 
long duration; 
int distance; 

void setup() 
{
 
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  
  duration = pulseIn(echoPin, HIGH);

  
  distance = (duration *0.0342)/ 2;

  // Add the distance to the sensor readings array
  sensorTotal = sensorTotal - sensorReadings[sensorIndex];
  sensorReadings[sensorIndex] = distance;
  sensorTotal = sensorTotal + sensorReadings[sensorIndex];
  sensorIndex = sensorIndex + 1;

  // If we've reached the end of the array, reset the index
  if (sensorIndex >= windowSize) 
  {
    sensorIndex = 0;
  }

  // Calculate the average distance
  distance = sensorTotal / windowSize;

  //print it to the serial monitor
  Serial.println(distance);
  delay(200);
}