class Sonar
{
private:
  //  Properties:
  const float speedOfSound      = 0.0343;   //  cm/μs
  const float errorMargin       = 300;      //  cm/s

  //  Pins:
  int vcc;
  int trig;
  int echo;

  //  Run-time:
  bool started            = false;
  float previousDistance  = 0;

public:
  Sonar(const int vccPin, const int trigPin, const int echoPin);

  bool measure();
};