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

Measuring distance of an object using ultrasonic distance sensor (28015 Ping) and also smoothen the sensor data using moving average filter.

Answer:

code:

#include

const int numReadings = 10; 

int readings[numReadings];  

int index = 0;  

int total = 0;  

int inches = 0;  

int cm = 0;  

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);  

void setup() {

  lcd.begin(16, 2);  

  lcd.print("New String !!!");  

  Serial.begin(9600);  

  pinMode(7, INPUT);  

}

void loop() {

  lcd.clear();  

  cm = 0.01723 * readUltrasonicDistance(7);  

  total = total - readings[index]; 

  readings[index] = cm;  

  total = total + readings[index]; 

  index = (index + 1) % numReadings; 

  cm = total / numReadings;  

  inches = cm / 2.54;  

  Serial.print("cm: ");  

  Serial.print(cm);  

  lcd.setCursor(0, 0);  

  lcd.print("cm: ");  

  lcd.setCursor(4, 0);  

  lcd.print(cm);   

  Serial.print("inch: ");  

  Serial.println(inches); 

  lcd.setCursor(0, 1);   

  lcd.print("inch: ");  

  lcd.setCursor(6, 1);   

  lcd.print(inches);  

  delay(250);   

}

long readUltrasonicDistance(int pin) {

  pinMode(pin, OUTPUT);  

  digitalWrite(pin, LOW);  

  delayMicroseconds(2);  

  digitalWrite(pin, HIGH);  

  delayMicroseconds(10); 

  digitalWrite(pin, LOW); 

  pinMode(pin, INPUT);  

  return pulseIn(pin, HIGH);  

}

List of components:

Name	Quantity	Component
U1	1	Arduino Uno R3
PING1	1	Ultrasonic Distance Sensor
U2	1	LCD 16 x 2
Rpot2	1	250 kΩ Potentiometer
R2	1	220 Ω Resistor