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

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.

// C++ code
int inches = 0;
#define SAMPLESIZE 10 // Filter Size Or Window Size
const int UL_PIN = 7;

int INDEX = 0;
int VALUE = 0;
int SUM = 0;
int avg[SAMPLESIZE];
int AVERAGE = 0;
int cm = 0;

void setup()
{
//pinMode(UL_PIN, INPUT); //ultrasonic sensor as input pin
Serial.begin(9600);

}

void loop()
{
pinMode(UL_PIN, OUTPUT);
digitalWrite(UL_PIN, LOW);
delayMicroseconds(2);
digitalWrite(UL_PIN, HIGH);
delayMicroseconds(5);
digitalWrite(UL_PIN, LOW);
//Moving average algorithm
SUM = SUM - avg[INDEX]; // subtract previous values
VALUE = analogRead(UL_PIN);// Read from ultrasonic sensor
SUM = SUM+VALUE;
INDEX = (INDEX+1)%SAMPLESIZE;//Increment the index and wrap it to zero if sample size is exceeded
AVERAGE = SUM / SAMPLESIZE; //Moving average formula
Serial.print(VALUE);
Serial.print(",");
//Serial.print("Smoothed:");
Serial.println(AVERAGE);
delay(5);

}