/*
   file DFRobot_PH.ino
   @ https://github.com/DFRobot/DFRobot_PH

   This is the sample code for Gravity: Analog pH Sensor / Meter Kit V2, SKU:SEN0161-V2
   In order to guarantee precision, a temperature sensor such as DS18B20 is needed, to execute automatic temperature compensation.
   You can send commands in the serial monitor to execute the calibration.
   Serial Commands:
     enterph -> enter the calibration mode
     calph   -> calibrate with the standard buffer solution, two buffer solutions(4.0 and 7.0) will be automaticlly recognized
     exitph  -> save the calibrated parameters and exit from calibration mode

   Copyright   [DFRobot](http://www.dfrobot.com), 2018
   Copyright   GNU Lesser General Public License

   version  V1.0
   date  2018-04
*/

#include "DFRobot_PH.h"
#include <EEPROM.h>

#define PH_PIN A1
float voltage, phValue, temperature = 25;
DFRobot_PH ph;

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

void loop()
{
  static unsigned long timepoint = millis();
  if (millis() - timepoint > 1000U) {            //time interval: 1s
    timepoint = millis();
    //temperature = readTemperature();         // read your temperature sensor to execute temperature compensation
    voltage = analogRead(PH_PIN) / 1024.0 * 5000; // read the voltage
    phValue = ph.readPH(voltage, temperature); // convert voltage to pH with temperature compensation
    Serial.print("temperature:");
    Serial.print(temperature, 1);
    Serial.print("^C  pH:");
    Serial.println(phValue, 2);
  }
  ph.calibration(voltage, temperature);          // calibration process by Serail CMD
}

float readTemperature()
{
  //add your code here to get the temperature from your temperature sensor
}