#include <SoftwareSerial.h>
#define rxPin 2
#define txPin 3
#define ANALOGPIN A0                        
SoftwareSerial HC06(rxPin, txPin);

#include <Statistic.h>
statistic::Statistic<float, uint32_t, true> myStats;

uint32_t start;
uint32_t stops;
char cmd;


void setup(void) {
  Serial.begin(9600);
  HC06.begin(9600);

  pinMode(rxPin, INPUT);
  pinMode(txPin, OUTPUT);
  
  myStats.clear();
  start = millis();
}


void loop(void) {
  stops = millis();
  
  // Read data from HC06
  if(HC06.available()){
    cmd = HC06.read();
    Serial.write(cmd);

    // Run / Stop app's options
    if(cmd == "A"){
      Serial.print("Function is on");
       
      // Read the input on analog pin A0:
      int sensorValue = analogRead(A0);
      
      // Convert the analog reading (which goes from 0 - 1023) to the water-level (0 - 618mm):
      int W_level = map(sensorValue, 0, 1023, 0, 618);
    
      // Print out the value in mm
      Serial.print("Water level = ");
      Serial.println(W_level);
      HC06.print(W_level);
      HC06.print("x");
      
      // Calculus of the Mean, Range, SEM (variation coefficient) and Time
      myStats.add(W_level);
      
      Serial.print("Average = ");
      int Average = myStats.average();
      Serial.println(Average);
      HC06.print(Average);
      HC06.print("x");
      
      Serial.print("Range = ");
      int Range = myStats.maximum() - myStats.minimum();
      Serial.println(Range);
      HC06.print(Range);
      HC06.print("x");
    
      Serial.print("SEM = ");
      float SEM = myStats.pop_stdev() / myStats.average();
      Serial.println(SEM, 4);
      HC06.print(SEM);
      HC06.print("x");
 
      Serial.print("time(s): ");
      float Time = (stops - start) / 1000;
      Serial.println(Time, 1);
      HC06.print(Time, 1);

      HC06.println();
      delay(400);
      }
        
    else if(cmd == "B"){Serial.println("Function is off");}
  }
}