Hall effect sensors

Other Hardware General Electronics
24

robtillaart:
That are quite smooth readings esp compared to the previous ones. You can smooth these readings even more in the loop() e.g. by only adjusting for 25% of the new rpm value;

loop()

{
  if (newRpm)
  {
    newRpm = false;
    int smoothrpm = (3*smoothrpm + rpm)/4;  // weighted average
    Serial.print(millis());
    Serial.print(", ");
    Serial.print(rpm );
    Serial.print(", ");
    Serial.println(smoothrpm );
  }
}

int smoothrpm = (3*smoothrpm + rpm)/4;  // weighted average



I changed to

int smoothrpm = ((3*smoothrpm + rpm)/4)*4;  // weighted average

this is the result

rpm 4210   smooth rpm 4208
rpm 3647   smooth rpm 3644
rpm 3726   smooth rpm 3724
rpm 3692   smooth rpm 3692
rpm 3703   smooth rpm 3700
rpm 3715   smooth rpm 3712
rpm 3692   smooth rpm 3692
rpm 3692   smooth rpm 3692
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3692   smooth rpm 3692
rpm 3669   smooth rpm 3668
rpm 3669   smooth rpm 3668
rpm 3692   smooth rpm 3692
rpm 3669   smooth rpm 3668
rpm 3669   smooth rpm 3668
rpm 3680   smooth rpm 3680
rpm 3669   smooth rpm 3668
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3658   smooth rpm 3656
rpm 3669   smooth rpm 3668
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680

Then tried this

int smoothrpm = ((9*smoothrpm + rpm)/10)*10;  // weighted average

gave this

rpm 3692   smooth rpm 3690
rpm 3692   smooth rpm 3690
rpm 3680   smooth rpm 3680
rpm 3692   smooth rpm 3690
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3669   smooth rpm 3660
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3669   smooth rpm 3660
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3669   smooth rpm 3660
rpm 3692   smooth rpm 3690
rpm 3669   smooth rpm 3660
rpm 3669   smooth rpm 3660
rpm 3870   smooth rpm 3870
rpm 3669   smooth rpm 3660
rpm 3680   smooth rpm 3680
rpm 3680   smooth rpm 3680
rpm 3658   smooth rpm 3650
rpm 3692   smooth rpm 3690