// 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 = 1;
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;
unsigned long Totalpumped =1;
unsigned long loopcount = 1;
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);
 

void setup()
{
  // Library for I2C / TWI device communication


// Library to control the LCD screen

  lcd.init();                   // initialise the LCD
  lcd.backlight();              // turn backlight on
  lcd.clear();                  // clear the screen

//LiquidCrystal_I2C lcd(0x3F, 16, 2);
  Serial.begin(115200);
  attachInterrupt(digitalPinToInterrupt(2), Pulse_Event, RISING);
  delay(1000);
}
void loop()
{
  generateFakeSignal();
 
//  lcd.setCursor(0, 0);          // set the cursor to position 1, line 1
 // lcd.print("Hello YouTube!");  // write on the screen

  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 - readings[readIndex];
  readings[readIndex] = RPM;
  total = total + readings[readIndex];
  readIndex = readIndex + 1;
  Totalpumped == readIndex + Totalpumped;
  if (readIndex >= numReadings)
  {
    readIndex = 0;
  }
  average = total / numReadings;
  Serial.print("\tMilliseconds: ");
  Serial.print(millis ());
  lcd.setCursor(0, 0);          // set the cursor to position 1, line 1
  //lcd.print("T:");  // write on the screen
 // lcd.print(millis ()/1000);  // write on the screen
  //lcd.print(" "); 
 // Serial.println("");
  Serial.print("\tTotal Liters: ");
  Serial.print(loopcount* 2.4711);
  lcd.print("Liters:");  // write on the screen
  lcd.print(loopcount* 2.4711);  // write on the screen
  lcd.setCursor(0, 1);          // set the cursor to position 1, line 2
  Serial.print("\tLPM: ");
  Serial.print(LPM);
  lcd.print("LPM:");  // write on the screen
  lcd.print(LPM);  // write on the screen
  Serial.print("\tRPM: ");
  Serial.print(RPM);
  lcd.print(" "); 
  lcd.print("RPM:");  // write on the screen
  lcd.print(RPM);  // write on the screen
  Serial.println("");

}
void Pulse_Event()  // The interrupt runs this to calculate the period between pulses:
{

  loopcount ++;
  PeriodBetweenPulses = micros() - LastTimeWeMeasured;
  LastTimeWeMeasured = micros();
  if(PulseCounter >= AmountOfReadings)
  {
    PeriodAverage = PeriodSum / AmountOfReadings;
    PulseCounter = 1;
    PeriodSum = PeriodBetweenPulses;
    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, 1000, 200000, 0);
// 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;
  }
}
/*

 * SDA is the serial data
 * SCL is the serial clock
 *
 * GND --> GND white
 * VCC --> 5V  grey
 * SDA --> A4  red
 * SCL --> A5  blue
 * 
 * 
 * I2C connections for each Arduino:
 * Uno, Ethernet    A4 (SDA), A5 (SCL)
 * Mega2560         20 (SDA), 21 (SCL)
 * Leonardo          2 (SDA),  3 (SCL)
 * Due              20 (SDA), 21 (SCL) or SDA1, SCL1
 *
 */


/* 
 * Set the correct chip for your LCD
 * Use 0x27 when you have the PCF8574 chip made by NXP
 * Use 0x3F when you have the PCF8574A chip made by Ti (Texas Instruments)
 * The last two digits represent the LCD size
 * e.g. 20x4 or 16x2
 *  
 */