// https://wokwi.com/projects/410217439172554753
// https://forum.arduino.cc/t/looking-for-a-pump-project-rate-volume-displacement/1305478

/*
Tachometer using micros
Made by InterlinkKnight
Last update: 05/23/2019
*/
const byte PulsesPerRevolution = 1; 
const unsigned long ZeroTimeout = 300000;
const byte numReadings = 5;
volatile unsigned long LastTimeWeMeasured;
volatile unsigned long PeriodBetweenPulses = ZeroTimeout+1000;
volatile unsigned long PeriodAverage = ZeroTimeout+1000;
unsigned long FrequencyRaw;
unsigned long FrequencyReal;
unsigned long RPM;
unsigned long PulseCounter = 1;
unsigned long PeriodSum;
unsigned long LastTimeCycleMeasure = LastTimeWeMeasured;
unsigned long CurrentMicros = micros();
unsigned int AmountOfReadings = 1;
unsigned int ZeroDebouncingExtra;
unsigned long readings[numReadings];
unsigned long readIndex;
unsigned long total;
unsigned long average;
unsigned long LPM;
 unsigned long TOTAL;
void setup()
{
  Serial.begin(115200);
  attachInterrupt(digitalPinToInterrupt(2), Pulse_Event, RISING);
  delay(1000);
}
void loop()
{
  generateFakeSignal();
  LastTimeCycleMeasure = LastTimeWeMeasured;
  CurrentMicros = micros();
  if(CurrentMicros < LastTimeCycleMeasure)
  {
    LastTimeCycleMeasure = CurrentMicros;
  }
  FrequencyRaw = 10000000000 / PeriodAverage;
  if(PeriodBetweenPulses > ZeroTimeout - ZeroDebouncingExtra || CurrentMicros - LastTimeCycleMeasure > ZeroTimeout - ZeroDebouncingExtra)
  {
    FrequencyRaw = 0;
    ZeroDebouncingExtra = 2000;
  }
  else
  {
    ZeroDebouncingExtra = 0;
  }
  FrequencyReal = FrequencyRaw / 10000;
  RPM = FrequencyRaw / PulsesPerRevolution * 60;
  RPM = RPM / 10000;
  LPM = RPM * 2.4711 ;
  // TOTAL = TOTAL++; //* 2.4711 ;
  total = total - readings[readIndex];
  readings[readIndex] = RPM;
  total = total + readings[readIndex];
  readIndex = readIndex + 1;
  if (readIndex >= numReadings)
  {
    readIndex = 0;
  }
  average = total / numReadings;

 // Serial.print("Period: ");
//  Serial.print(PeriodBetweenPulses);
//  Serial.print("\tReadings: ");
// Serial.print(AmountOfReadings);
 // Serial.print("\tFrequency: ");
 // Serial.print(FrequencyReal);
 // Serial.print("\tRPM: ");
// Serial.print(RPM);
// Serial.print("\tTachometer: ");
// Serial.println(average);
 // Serial.print("\t readings: ");
//Serial.print (readings[numReadings]);
  Serial.print("\tTOTAL: ");

  Serial.print(TOTAL++ * 2.4711);
  Serial.print("\tLPM: ");
  Serial.print(LPM);
 // Serial.print("\tFrequency: ");
//  Serial.print(FrequencyReal);
 // Serial.print("\tRPM: ");
//  Serial.print(RPM);
}
void Pulse_Event()  // The interrupt runs this to calculate the period between pulses:
{
  //TOTAL++;
  PeriodBetweenPulses = micros() - LastTimeWeMeasured;
  LastTimeWeMeasured = micros();
  if(PulseCounter >= AmountOfReadings)
  {
    PeriodAverage = PeriodSum / AmountOfReadings;
    PulseCounter = 1;
    PeriodSum = PeriodBetweenPulses;
   // TOTAL++;
    int RemapedAmountOfReadings = map(PeriodBetweenPulses, 40000, 5000, 1, 10);
    RemapedAmountOfReadings = constrain(RemapedAmountOfReadings, 1, 10);
    AmountOfReadings = RemapedAmountOfReadings;
  }
  else
  {

    PulseCounter++;
    PeriodSum = PeriodSum + PeriodBetweenPulses;
  }
}





# define signal  8       // fake signal output pin
# define control A0      // frequency control pin

void generateFakeSignal()
{
  static unsigned long lastEdge;
  unsigned long now = micros();

  long periodHalf = analogRead(control);
  periodHalf = map(periodHalf, 0, 1023, 300000L, 300L);
// Serial.print("                                   "); Serial.println(periodHalf);
  if (now - lastEdge > periodHalf) {
    pinMode(signal, OUTPUT);  // <-- should be in setuo, just didn't wanna
    digitalWrite(signal, digitalRead(signal) == LOW ? HIGH : LOW);

    lastEdge = now;
  }
}