#include <LiquidCrystal.h>

int trigPin = 13; //sensor's trigger pin connected to pin 13 int echoPin = 7; //sensor's echo pin connected to pin 11 float pingTime; //time for the ping to hit the target and back float ss; //we will calculate the speed of sound float td = 13; //target distance.

void setup() { // put your setup code here, to run once:

// initialize the library with the numbers of the interface pins LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

Serial.begin(9600); pinMode(trigPin,OUTPUT); //TRIG AS OUTPUT pinMode(echoPin,INPUT); //EHO AS AN INPUT

// set up the LCD's number of columns and rows: lcd.begin(16, 2); // Print a message to the LCD. lcd.println(ss);

}

void loop() { // put your main code here, to run repeatedly:

digitalWrite(trigPin,LOW); //set trig pin low. delayMicroseconds(2000); digitalWrite(trigPin,HIGH); delayMicroseconds(100); digitalWrite(trigPin,LOW); pingTime = pulseIn(echoPin,HIGH); //measure ping time traveltime in microseconds. ss= 2td / pingTime; //gives us speed in inches per microseconds. ss=ss/633601000000*3600; //gives us speed in miles per hour. Serial.print("The speed of sound is "); Serial.print(ss); Serial.println(" miles per hour");

// Turn off the blinking cursor: lcd.noBlink(); delay(3000); // Turn on the blinking cursor: lcd.blink(0); delay(3000);

}

#include <LiquidCrystal.h>
int trigPin = 13; //sensor's trigger pin connected to pin 13
int echoPin = 7; //sensor's echo pin connected to pin 11
float pingTime; //time for the ping to hit the target and back
float ss; //we will calculate the speed of sound
float td = 13; //target distance.
void setup() {
 // put your setup code here, to run once:
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 Serial.begin(9600);
 pinMode(trigPin,OUTPUT); //TRIG AS OUTPUT
 pinMode(echoPin,INPUT); //EHO AS AN INPUT
 // set up the LCD's number of columns and rows:
 lcd.begin(16, 2);
 // Print a message to the LCD.
 lcd.println(ss);
 
}
void loop() {
 // put your main code here, to run repeatedly:
 digitalWrite(trigPin,LOW); //set trig pin low.
 delayMicroseconds(2000);
 digitalWrite(trigPin,HIGH);
 delayMicroseconds(100);
 digitalWrite(trigPin,LOW);
 pingTime = pulseIn(echoPin,HIGH); //measure ping time traveltime in microseconds.
 ss= 2*td / pingTime; //gives us speed in inches per microseconds.
 ss=ss/63360*1000000*3600; //gives us speed in miles per hour.
 Serial.print("The speed of sound is ");
 Serial.print(ss);
 Serial.println(" miles per hour"); 
 
 // Turn off the blinking cursor:
 lcd.noBlink();
 delay(3000);
 // Turn on the blinking cursor:
 lcd.blink(0);
 delay(3000);
 
}