Ph sensor and thingspeak collidng

[aniqchino]

#include <Arduino.h>
#include "DFRobot_LCD.h"
#include <Wire.h>
#include "WiFi.h"
#include "ThingSpeak.h"

**// ThingSpeak----------------------------------------------------------------------/**
**WiFiClient client;**
**char ssid[] = "ASUS nanosun-123";**
**char pass[] = "201312279c"; **
**int status = WL_IDLE_STATUS;**
**unsigned long myChannelNumber = 1967185;**
**const char * myWriteAPIKey = "A3Y9LSEOI6ETE19T";**



// DO SENSOR-----------------------------------------------------------------/
#define DO_PIN A1
#define VREF 5000 // VREF(mv) 
#define ADC_RES 1024 //ADC Resolution/

#define SINGLE_POINT_CALIBRATION 0
#define READ_TEMP (25)

#define CAL1_V (8354) //mv  CHANGE AFTER CALIBRATION
#define CAL1_T (25)   //℃


const uint16_t DO_Table[41] = {
  14460, 14220, 13820, 13440, 13090, 12740, 12420, 12110, 11810, 11530,
  11260, 11010, 10770, 10530, 10300, 10080, 9860, 9660, 9460, 9270,
  9080, 8900, 8730, 8570, 8410, 8250, 8110, 7960, 7820, 7690,
  7560, 7430, 7300, 7180, 7070, 6950, 6840, 6730, 6630, 6530, 6410};

uint8_t Temperaturet;
uint16_t ADC_Raw;
uint16_t ADC_Voltage;
uint16_t DO;

int16_t readDO(uint32_t voltage_mv, uint8_t temperature_c)
{
  #if SINGLE_POINT_CALIBRATION == 00
    uint16_t V_saturation = (uint32_t)CAL1_V + (uint32_t)35 * temperature_c - (uint32_t)CAL1_T * 35;
    return (voltage_mv * DO_Table[temperature_c] / V_saturation);
  #else
    uint16_t V_saturation = (int16_t)((int8_t)temperature_c - CAL2_T) * ((uint16_t)CAL1_V - CAL2_V) / ((uint8_t)CAL1_T - CAL2_T) + CAL2_V;
    return (voltage_mv * DO_Table[temperature_c] / V_saturation);
  #endif
}

// pH SENSOR---------------------------------------/
DFRobot_LCD lcd(16, 2); //16 characters and 2 lines of show

#**define PH_PIN 25 **
**float voltage,phvalue,temperature = 25;**

**float acidVoltage = 2000; //buffer solution at 4.o **
**float neutralVoltage = 1390;   //buffer solution at 7.o **

**const int Sensor_MINvalue1 = 6.5; // +-0.5 from ph 4.0**
**const int Sensor_MAXvalue1 = 7.5;**



void setup()
{
  Serial.begin(115200);


    // LCD Begin //
  lcd.init();
  lcd.setCursor(4,0);
  lcd.print("Welcome");
  delay(1000);
  lcd.clear();

  lcd.setCursor(3,0);
  lcd.print("Reading ");
  lcd.setCursor(3,1);
  lcd.print("pH & DO");
  delay(1000);
  lcd.clear();

  lcd.setCursor(3,0);
  lcd.print("Please Wait");
  delay(1000);
  lcd.clear();

}



void loop()
{
**//ThingSpeak----------------------------------------------------------//**
**      delay(100);**
**      float P = phvalue;**
**      float D = (readDO(ADC_Voltage, Temperaturet)/1000);**

**      ThingSpeak.setField(1,P);**
**      ThingSpeak.setField(2,D); **
**      ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);** 

  **//pH SENSOR--------------------------------------//**
**    static unsigned long timepoint = millis();**

**    if(millis()-timepoint>1000U){**
**      timepoint = millis();// timepoint = read temperature **

**      voltage = analogRead (PH_PIN)/4095.0*3300; **

**      float slope = (7.0-4.0)/((neutralVoltage-1500)/30 - (acidVoltage-1500)/3.0);**
**      float intercept = 7.0 - slope*(neutralVoltage-1500)/3.0;**

**      phvalue = slope*(voltage-1500)/3.0 + intercept;   // y=k*x + b [formula]**

      if( phvalue < Sensor_MAXvalue1 && phvalue > Sensor_MINvalue1 ){
         Serial.print("Voltage:");
         Serial.print(voltage,1);
         Serial.print("PH:");
         Serial.println(phvalue,2);

          //LCD setting 16x2
         lcd.setCursor(0,0);
         lcd.print("PH: ");
        
         lcd.print(phvalue,2);

         lcd.setCursor(0,1);
         lcd.print("Volt: ");
         lcd.print(voltage/1000,2);} 
      else {
        lcd.init();
        lcd.setCursor(0,0);
        lcd.print("DOSING REQUIRED");
        delay(1000);
        lcd.clear(); }   
    }

    Temperaturet = (uint8_t)READ_TEMP;
    ADC_Raw = analogRead(DO_PIN);
    ADC_Voltage = uint32_t(VREF) * ADC_Raw / ADC_RES;

    Serial.print("Temperaturet:\t" + String(Temperaturet) + "\t");
    Serial.print("ADC RAW:\t" + String(ADC_Raw) + "\t");
    Serial.print("ADC Voltage:\t" + String(ADC_Voltage) + "\t");
    Serial.println("DO:\t" + String(readDO(ADC_Voltage, Temperaturet)) + "\t"); 

    //LCD setting 16x2
    lcd.setCursor(9,0);
    lcd.print((readDO(ADC_Voltage, Temperaturet))/1000);
    lcd.print("mg/L");
    delay(5000);
    lcd.clear();   
    return; 
}

I have posted a similar code before but about a different question, as of now. i have fixed my thingSpeak, Dissolved Oxygen sensor.

however, upon including the thingspeak code into t it causes my Ph sensor to misread the ph from 7ph it would read 15.16047ph I believe it's not the code that's having the issue but the formula [ calculation ] , is there a way for me to change it so that it would read back 7ph instead. the bolded code is my ph and thins