File content as of revision 1:ea41d3c33200:

    #include "mbed.h"
    #include "ultrasonic.h"
    
     void dist(int distance)
    {
        //put code here to happen when the distance is changed
        printf("Distance changed to %dmm\r\n", distance);
    }
    
    ultrasonic mu(D2, D4, 100ms, 1s, &dist);    //Set the trigger pin to D2 and the echo pin to D4
                                                //have updates every .1 seconds and a timeout after 1
                                                //second, and call dist when the distance changes
    
    int main()
    {
        mu.startUpdates();//start mesuring the distance
        while(1)
        {
            //Do something else here
            mu.checkDistance();     //call checkDistance() as much as possible, as this is where
                                    //the class checks if dist needs to be called.
        }
    }