#include <SoftwareSerial.h>

#define WaterLevelLow   A2
#define WaterLevelMed   A1
#define WaterLevelHigh  A0
#define flowsensor      2
#define rxPin           3
#define txPin           4

SoftwareSerial ss(rxPin, txPin);

float var1;
int var2;
int waterLevel = 0;
int WaterLevelLowValue = 0;
int WaterLevelMedValue = 0;
int WaterLevelHighValue = 0;
double flow; //Water flow L/Min
unsigned long currentTime;
unsigned long lastTime;
unsigned long pulse_freq;

void pulse () { // Interrupt function
  pulse_freq++;
}

void setup() {
  pinMode(WaterLevelLow, INPUT);
  pinMode(WaterLevelMed, INPUT);
  pinMode(WaterLevelHigh, INPUT);
  pinMode(flowsensor, INPUT);
  Serial.begin(9600);
  ss.begin(9600);
  attachInterrupt(0, pulse, RISING); // Setup Interrupt
  currentTime = millis();
  lastTime = currentTime;
}

void loop () {
  WaterLevelLowValue = analogRead(WaterLevelLow);
  WaterLevelMedValue = analogRead(WaterLevelMed);
  WaterLevelHighValue = analogRead(WaterLevelHigh);
  if (WaterLevelLowValue < 130 && WaterLevelMedValue < 130 && WaterLevelHighValue < 130) {
    waterLevel = 0;//tank is @  0% Empty
  }
  else if (WaterLevelLowValue > 130 && WaterLevelMedValue < 130 && WaterLevelHighValue < 130) {
    waterLevel = 30;//tank is @  30%
  }
  else if (WaterLevelLowValue > 130 && WaterLevelMedValue > 130 && WaterLevelHighValue < 130) {
    waterLevel = 60;//tank is @  60%
  }
  else if (WaterLevelLowValue > 130 && WaterLevelMedValue > 130 && WaterLevelHighValue > 130) {
    waterLevel = 100;//tank is @ 100% Full
  }
  currentTime = millis();
  // Every second, calculate and print L/Min
  if (currentTime >= (lastTime + 1000))
  {
    lastTime = currentTime;
    // Pulse frequency (Hz) = 7.5Q, Q is flow rate in L/min.
    flow = (pulse_freq / 7.5);
    pulse_freq = 0; // Reset Counter
    Serial.print(flow, DEC);
    Serial.println(" L/Min");
    Serial.println("______________________");
    Serial.print("Water Level: ");
    Serial.println(waterLevel);
    Serial.println("______________________");
    Serial.print("LowValue: ");
    Serial.println(WaterLevelLowValue);
    Serial.print("MedValue: ");
    Serial.println(WaterLevelMedValue);
    Serial.print("HighValue: ");
    Serial.println(WaterLevelHighValue);
    var1 = flow;
    var2 = waterLevel;
    ss.print(var1, 2);
    ss.print("A");
    ss.print(var2);
    ss.print("B");
    ss.print("\n");
  }
}