#define pinoInterrupcao 3
#define NPINS 10
#define RPM_MAX 10500
int pins[NPINS]={A4,A5,2,4,5,6,7,8,9,10};
long aux=0;

void isr(){
  aux++;
}

void setup() {

  pinMode(pinoInterrupcao, INPUT);
  for(int i=0;i<NPINS;i++)
    pinMode(pins[i],OUTPUT);
  Serial.begin(115200);
  attachInterrupt(digitalPinToInterrupt(pinoInterrupcao),isr,RISING);
}
void set_rpm_bar(int r){
  int n= (RPM_MAX-100)/10;
  n=r/n;
  if(r<50)
    n=0;
  for(int i=0;(i<NPINS)&&(i<n);i++)
    digitalWrite(pins[i], HIGH);
  for(int i=(n);(i<NPINS);i++)
    digitalWrite(pins[i], LOW);
}
void loop() {

  long a = millis();
  while( (millis()-a) < 100 );

  float rpm = float(aux * 600);
  aux = 0;
  //Serial.println(rpm);

  set_rpm_bar(rpm);
}