Calcula_RPM

float numeroCil = 6;
unsigned long tempoInicial;
unsigned long pulsos;
float rpm = 0;
//-----------------------------------
void ContaPulsos()
{
  pulsos++;
}
//------------------------------------
void setup()
{
  Serial.begin(9600);
  pulsos = 0;
  attachInterrupt(0, ContaPulsos, RISING);
  tempoInicial = millis();
}
//------------------------------------
void loop()
{
  if ((millis() - tempoInicial) >= 200)
  {
    tempoInicial = millis();
    rpm = (((float)pulsos / ((float)numeroCil / 2)) ) * 300;
    Serial.println(rpm,0);
    pulsos = 0;
  }
}