/*
  # This sample code is used to test the pH meter V1.0.
  # Editor : YouYou
  # Ver    : 1.0
  # Product: analog pH meter
  # SKU    : SEN0161
*/
/*
  Example using the SparkFun HX711 breakout board with a scale
  By: Nathan Seidle
  SparkFun Electronics
  Date: November 19th, 2014
  License: This code is public domain but you buy me a beer if you use this and we meet someday (Beerware license).

  This example demonstrates basic scale output. See the calibration sketch to get the calibration_factor for your
  specific load cell setup.

  This example code uses bogde's excellent library: https://github.com/bogde/HX711
  bogde's library is released under a GNU GENERAL PUBLIC LICENSE

  The HX711 does one thing well: read load cells. The breakout board is compatible with any wheat-stone bridge
  based load cell which should allow a user to measure everything from a few grams to tens of tons.
  Arduino pin 2 -> HX711 CLK
  3 -> DAT
  5V -> VCC
  GND -> GND

  The HX711 board can be powered from 2.7V to 5V so the Arduino 5V power should be fine.

*/
#include <math.h>
#include "HX711.h"

#define Offset 0.09//-0.31            //pH meter deviation compensate
#define calibration_factor -9420.0 //This value is obtained using the SparkFun_HX711_Calibration sketch
//#define DOUT  6
//#define CLK  7



// define pin numbers
const int tempPin = 16; //PC3
const int pHPin = A1; //PC1
const int DOUT = 6; //PD6
const int CLK = 7; //PD7

  float mass = 0;
  float mass0 = 0;

//Set scale
HX711 scale(DOUT, CLK);

float Temperature() {
  float reading;
  reading = analogRead(tempPin);
  double Temp, T;
  double R = 10000 / (1023.0 / reading - 1);
  double loka = 10000 / R; //loka = R0/R
  T = 0.0033540164 + 0.00026666666 * log(loka); //Steinhart-Hart 1/T=1/T0 + 1/B*ln(R0/R)
  T = 1 / T;

  Temp = T - 273.15; //To get Celcius degrees

}

float PHRead() {
  float pHvalue = 0;
  float voltage = 0;

  voltage = analogRead(pHPin) * 5.0 / 1024;
  //pinMode(1, OUTPUT);
//  Serial.print("Voltage:");
//  Serial.print(voltage, 5);
  //pinMode(1, INPUT);
  pHvalue = 0.1196836333 * pow(voltage, 6.2034289432) + Offset;//0.2543 * pow(voltage, 5.7574) + Offset;
  //  Serial.print("    pH value: ");
  //  Serial.println(pHvalue);

  return pHvalue;
}

void setup() {
  Serial.begin(4800);
  //pinMode(1, INPUT);
  pinMode(pHPin, INPUT);
  //pinMode(tempPin, INPUT);

  scale.set_scale(calibration_factor); //This value is obtained by using the SparkFun_HX711_Calibration sketch
  scale.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0

}

void loop() {
  float pHValue = 0;

  float temperature = 0;
  float pHadjustment = 0;
  float fertilizerAdjustment = 0;
  float steps = 0;
  float H3PO4 = 0.1875; //ml/l
  float fertilizer = 3; //ml/l
  String motor1 = "9,1,";
  String motor2 = "9,2,";
//  String motor4 = "9,2,";
  String message, message2;
  float steps3;
  int steps2 = 0;
    int steps4 = 0;

  pHValue = PHRead();

  //pinMode(1, OUTPUT);

//  Serial.print("pH in loop: ");
//  Serial.println(pHValue);

//  Serial.print("Reading: ");

//  Serial.print(mass);
//  Serial.print(" kg"); //You can change this to kg but you'll need to refactor the calibration_factor
//  Serial.println();
  //pinMode(1, INPUT);
//  Serial.println(scale.get_units());
  mass = scale.get_units(); //scale.get_units() returns a float
  
  if (pHValue >= 6.5 && pHValue <= 7) {
    //Calculate the need for the phosphoric acid.
    //ml/l*l
    steps = 67; //single pumping volume 0.13333 ml, 200 steps full rotation -> 66.667 steps single volume

    steps = round(steps);
    steps2 = int(steps);
    message = motor1 + steps2;
    //pinMode(1, OUTPUT);

    Serial.println(message);
    //pinMode(1, INPUT);

  }
  else if (pHValue >= 7 && pHValue <= 7.5) {
    //Calculate the need for the phosphoric acid.
    pHadjustment = H3PO4 * mass * 0.25; //ml/l*l
    steps = pHadjustment / 0.133333 * 66.6667; //single pumping volume 0.13333 ml, 200 steps full rotation -> 66.667 steps single volume

    steps = round(steps);
    steps2 = int(steps);
    message = motor1 + steps2;
    //pinMode(1, OUTPUT);

    Serial.println(message);
    //pinMode(1, INPUT);


  }
  else if (pHValue >= 7.5 && pHValue <= 8) {
    
    //Calculate the need for the phosphoric acid.
    pHadjustment = H3PO4 * mass * 0.5; //ml/l*l
    steps = pHadjustment / 0.133333 * 66.6667; //single pumping volume 0.13333 ml, 200 steps full rotation -> 66.667 steps single volume

    steps = round(steps);
    steps2 = int(steps);
    message = motor1 + steps2;
    //pinMode(1, OUTPUT);

    Serial.println(message);
    //pinMode(1, INPUT);




  }
  else if (pHValue >= 8) {
    //Calculate the need for the phosphoric acid.
    //mass = 10;
    pHadjustment = H3PO4 * mass; //ml/l*l
    steps = pHadjustment / 0.133333 * 66.6667; //single pumping volume 0.13333 ml, 200 steps full rotation -> 66.667 steps single volume

    steps = round(steps);
    steps2 = int(steps);
    message = motor1 + steps2;
    //pinMode(1, OUTPUT);

    Serial.println(message);
    //pinMode(1, INPUT);


  }

    
    delay(5000);
    if(mass > mass0){
    fertilizerAdjustment = fertilizer * mass; //ml/l
    steps3 = fertilizerAdjustment / 0.133333 * 66.6667;
    steps3 = round(steps3);
    steps4 = int(steps3); 
    message2 = motor2 + steps4;
    Serial.println(message2);
    }
    
    mass0 = mass + 0.5;

  /* temperature = Temperature();
    Serial.print(temperature);
    Serial.println(" C");
  */
  //pinMode(1, INPUT);
    delay(90000);

}