Problem with ultrasonic sensor code

Using Arduino Sensors
1

Hey I'm having problems with my code when trying to format the distance reading from my sensor as a float. Please excuse my probably stupid question I'm quite new but why won't it work. I've managed to get the inches value as a float but I don't know how I did.
Thanks

/**

  • Date: 13/04/2020
  • Aim: To use Ultrasonic sensor to measure the distance between objects. Intergrate physics and maths as the speed of sound is required
    • 343m/s. It requires a pulse for atleast 2microseconds to generate a signal which is read by the Tx. The equation S = D/T is used to calculate
  • the distance.
    */

//Declare the variables to send/receive signal
#define OUT 10
#define IN 13

//Declare the variables to calculate the distance
long Duration;
float DistanceCM;

void setup()
{
// put your setup code here, to run once:
//Initialise serial communications
Serial.begin(9600);

//Declare the pins as outputsd and inputs
pinMode(OUT, OUTPUT);
pinMode(IN, INPUT);

}

void loop()
{
// put your main code here, to run repeatedly:
//Send out a signal by providing a volatge for at least 2 microseconds
digitalWrite(OUT, LOW);
delayMicroseconds(2);

digitalWrite(OUT, HIGH);
delayMicroseconds(10);

digitalWrite(OUT, LOW);

//Use the pulse in function to get the time in ms whilst Pulse is High
Duration = pulseIn(IN, HIGH);

//Call function to calculate the distance in cm
DistanceCM = CalcDistanceCm(Duration);

//Print the values to the console - make sure it is within range of 2 - 400cm
if(DistanceCM > 400 || DistanceCM < 2)
{
//Print error
Serial.println("Out of Range");
}
else
{
Serial.print("The object is: ");
Serial.print(DistanceCM);
Serial.print("cm or ");
Serial.print(DistanceCM/2.54);//divide for inches
Serial.println("In away.");

//Delay
delay(100);
}
}//end main

long CalcDistanceCm(long Duration)
{
//Calculate the distance by D = S x T
DistanceCM = 0.0343 * (Duration/2.0);//Remember the time is double as it goes out then comes back

//Calibrate by adding 1cm
DistanceCM = DistanceCM + 1.0;

//return the value
return (DistanceCM);

}//end function to return the value in cm

2

Here, have these [code][/code]

but why won't it work. I've managed to get the inches value as a float but I don't know how I did.

I have no idea what that is supposed to mean.

3

You forgot to say exactly what the problem is. But maybe it's related to the fact that you first declare DistanceCM as a float but then you populate it with a long returned from CalcDistanceCm(). Long is an integer type.

Steve

4