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

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.

CODE:

//including the libraries
#define TRIG 3
#define ECHO 2
#include<Wire.h>
// declaring the variables
int duration;
int distance;
int average=0;
void setup()
{
pinMode(TRIG, OUTPUT);//taking pin 3 as output
pinMode(ECHO,INPUT);//taking pin 2 as input
Serial.begin(9600);//serial communication begins
Wire.begin();//I2C communication begins here
}

void loop()
{

digitalWrite(TRIG,HIGH);//trigger pin taken as high
delayMicroseconds(10);//given few delay
digitalWrite(TRIG,LOW);//trigger pin taken as low
duration=pulseIn(ECHO,HIGH);//time is obtained
distance=duration*(0.034/2);//distance is calculated
//data is transmitted to slave
Wire.beginTransmission(8);
Wire.write(distance);//distance is send to slave
Wire.endTransmission();
Wire.requestFrom(8,1);//data is requested from slave
average=Wire.read();//slave data is stored
//data is printed on the serial monitor
Serial.print("The distance is : ");
Serial.print(distance);
Serial.println();
Serial.print("Distance from average filter is ");
Serial.print(average);
Serial.println();

}

//slave

#include<Wire.h>
#define WINDOW_SIZE 5

int INDEX = 0;
int VALUE = 0;
int SUM = 0;
int READINGS[WINDOW_SIZE];
int AVERAGED = 0;
void setup() {
Wire.begin(8);
Serial.begin(9600);
Wire.onRequest(RequestEvent);
Wire.onReceive(ReceiveEvent);
}

void loop() {


delay(25);
}
void ReceiveEvent(int howMany)
{
SUM = SUM - READINGS[INDEX]; // Remove the oldest entry from the sum
VALUE = Wire.read(); // Read the next sensor value
READINGS[INDEX] = VALUE; // Add the newest reading to the window
SUM = SUM + VALUE; // Add the newest reading to the sum
INDEX = (INDEX+1) % WINDOW_SIZE; // Increment the index, and wrap to 0 if it exceeds the window size
AVERAGED = SUM / WINDOW_SIZE; // Divide the sum of the window by the window size for the result
Serial.print(VALUE);
Serial.print(",");
Serial.println(AVERAGED);

}
void RequestEvent(){
Wire.write(AVERAGED);
}

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.