//WaterFlow Code (2019), 
// adopted from https://www.bc-robotics.com/tutorials/using-a-flow-sensor-with-arduino/

int flowPin = 2;    //This is the input pin on the Arduino
double flowRate;    //This is the value we intend to calculate. 
volatile int count; //This integer needs to be set as volatile to ensure it updates correctly during the interrupt process.  
 
void setup() {
  // put your setup code here, to run once:
  pinMode(flowPin, INPUT);           //Sets the pin as an input
  attachInterrupt(0, Flow, RISING);  //Configures interrupt 0 (pin 2 on the Arduino Uno) to run the function "Flow"  
  Serial.begin(9600);  //Start Serial
}

void loop() {
  // put your main code here, to run repeatedly:
count = 0;      // Reset the counter so we start counting from 0 again
  interrupts();   //Enables interrupts on the Arduino
  delay (1000);   //Wait 1 second 
  noInterrupts(); //Disable the interrupts on the Arduino

  //Start the math
  flowRate = (count * 2.25);        //Take counted pulses in the last second and multiply by 2.25mL 
  flowRate = flowRate * 60;         //Convert seconds to minutes, giving you mL / Minute
  flowRate = flowRate / 1000;       //Convert mL to Liters, giving you Liters / Minute

   Serial.println(flowRate);         //Print the variable flowRate to Serial
}

void Flow()
{
   count++; //Every time this function is called, increment "count" by 1
}