//06/06/2022 16:51:37
//sketch_Water_level_ON_OFF_V3
//ELEGOO UNO R3, Classic BT using HC-06 module Elegoo

#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 ugStart;
uint32_t ugStops;
float fgProcessTime;
float fgSEM;
char cgCmd;
int igSensorValue;
int igWaterLevel;
int igAverage;
int igRange;
unsigned long lgUpdateTime;

void setup(void)
{
               pinMode(rxPin, INPUT);
               pinMode(txPin, OUTPUT);

               myStats.clear();
                    ugStart = millis();
               lgUpdateTime = millis();

               Serial.begin(9600);
                 HC06.begin(9600);
}

void loop(void)
{
	           if(millis() - lgUpdateTime > 400)      //Loop approx every 0.007 seconds (Tweak this up if problems occur)
             {
                              ugStops = millis();
                         lgUpdateTime = millis(); 
                         
                         //Input from App
                         if(HC06.available())
                         {
                                   //Read data from HC06
                                   cgCmd = HC06.read();
                                   Serial.write(cgCmd);
                         
                                   // Run / Stop app's options
                                   if(cgCmd == "A")
                                   {
                                             Serial.println("Function is on");
                                   }
                                   else if(cgCmd == "B")
                                   {
                                             Serial.println("Function is off");
                                   }
                         }
                         //Output
                         else
                         {
                                   // Read the input on analog pin A0:
                                   igSensorValue = analogRead(A0);
                         
                                   // Convert the analog reading (which goes from 0 - 1023) to the water-level (0 - 618mm):
                                   igWaterLevel = map(igSensorValue, 0, 1023, 0, 618);
                         
                                   // Calculus of the Mean, Range, SEM (variation coefficient) and Time
                         
                                                   myStats.add(igWaterLevel);
                                       igAverage = myStats.average();
                                         igRange = myStats.maximum() - myStats.minimum();
                                           fgSEM = myStats.pop_stdev() / myStats.average();
                                   fgProcessTime = (ugStops - ugStart) / 1000;
                         
                                   //To PC Arduino Serial Monitor via USB
                                   Serial.print("Water level = ");
                                   Serial.println(igWaterLevel);
                                   Serial.print("Average = ");
                                   Serial.println(igAverage);
                                   Serial.print("Range = ");
                                   Serial.println(igRange);
                                   Serial.print("SEM = ");
                                   Serial.println(fgSEM, 4);
                                   Serial.print("time(s): ");
                                   Serial.println(fgProcessTime, 1);
                         
                                   //To Android App via Bluetooth
                                   HC06.print(igWaterLevel);
                                   HC06.print("x");
                                   HC06.print(igAverage);
                                   HC06.print("x");
                                   HC06.print(igRange);
                                   HC06.print("x");
                                   HC06.print(fgSEM,4);
                                   HC06.print("x");
                                   HC06.print(fgProcessTime, 1);
                                   HC06.println();
                         }
               }
}