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

Project 2:

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

Answer:

#define SAMPLESIZE 10 // Filter Size Or Window Size

const int UL_PIN = 8;

int INDEX = 0;//By using index, we can access the array elements

int VALUE = 0;// initilaize the value

int SUM = 0;// initilaize the sum

int avg[SAMPLESIZE];//array of sensor data readings and average them.

int AVERAGE = 0;// initilaize the Average

int cm = 0;// initilaize the cm

int inches = 0;//initilaize the inches

void setup()

{

Serial.begin(9600); //Begins Serial Communication at 9600 baud rate

}

void loop()

{

pinMode(UL_PIN, OUTPUT);

digitalWrite(UL_PIN, LOW);

delayMicroseconds(2);

digitalWrite(UL_PIN, HIGH);

delayMicroseconds(5);

digitalWrite(UL_PIN, LOW);

pinMode(UL_PIN, INPUT);

//Moving average algorithm

VALUE = analogRead(UL_PIN)*0.01723;// Read from ultrasonic sensor

SUM = SUM+VALUE;

INDEX = ++INDEX % SAMPLESIZE;//Increment the index 1 and wrap it to zero if sample size is exceeded

SUM = SUM - avg[INDEX]; // subtract previous values

AVERAGE = SUM / SAMPLESIZE; //Moving average formula

Serial.print(VALUE);

Serial.print(",");

Serial.println(AVERAGE);

delay(5);

}