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

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

Program:

// Measuring the distance using ultrasonic sensor

void US_Tx();
unsigned int US_Rx();
float mov_Avg();
float MicroToinches(float);

void setup()
{
Serial.begin(9600); //begin serial communication at 9600 baud rate
}

void loop()
{
float Time=mov_Avg();
float distance = MicroToinches(Time); //to find distance converting time microseconds into inches
Serial.print(distance); //to print distance in serial monitor
Serial.println();
}
void US_Tx() //Generating the pulses
{
pinMode(7,OUTPUT); //set pin 7 as output value

digitalWrite(7,LOW); //pin 7 equal to low state
delayMicroseconds(2); //delay for 2 microseconds

digitalWrite(7,HIGH); //pin 7 equal to high state
delayMicroseconds(5); //delay for 5 microseconds

digitalWrite(7,LOW); //pin 7 equal to low state
delayMicroseconds(2); //delay for 2 microseconds
}

unsigned int US_Rx()
{
pinMode(7,INPUT);
unsigned int Duration = pulseIn(7, HIGH);
return Duration; //how much duration pin is high in Ms

}

float MicroToinches(float D) //calling the duration value
{
float inches=D/73.35/2; //convert duration into inches
return inches; //return the value
}

float mov_Avg()
{
int window_size =5; //declaring window size
int data[window_size];
US_Tx(); //Triggering the data
data[0]=US_Rx(); //Receiving the data
US_Tx();
data[1]=US_Rx();
US_Tx();
data[2]=US_Rx();
US_Tx();
data[3]=US_Rx();
US_Tx();
data[4]=US_Rx();


float filterValue = (data[0]+ data[1]+data[2]+data[3]+data[4])/window_size; //To find moving average value
return filterValue;

}

Output: