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#include <LiquidCrystal.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#define set A0 //set pin on A0
#define inc A1 //increment pin on A1
#define dec A2 //decrement pin on A2
//********Serial_Data**************
float data1 = 0;
float data2 = 0;
float data3 = 0;
//######################SETTINGS_FOR_EC_MEASUREMENT##############################
#define ECPump 10
#define ONE_WIRE_BUS 6 // Data wire For Temp Probe is plugged into pin 2 on the Arduino
int R1=450; //resistance provided for the votage
int Ra=25; //Resistance of powering Pins
int ECPin= A3;
int ECGround=A4;
int ECPower =A5;
float TemperatureCoef = 0.019; //this changes depending on what chemical we are measuring
float K=3.3; //value from the calibration test
OneWire oneWire(ONE_WIRE_BUS); // Setup a oneWire instance to communicate with any OneWire devices
const int TempProbePossitive =9; //Temp Probe power connected to pin 9
const int TempProbeNegative=8; //Temp Probe Negative connected to pin 8
DallasTemperature sensors(&oneWire); // Pass our oneWire reference to Dallas Temperature.
float Temperature=0;
float EC=0;
float EC25 =0;
float finalEC=0;
float raw= 0;
float Vin= 5;
float Vdrop= 0;
float Rc= 0;
float buffer=0;
int ecMaxStatus=0; //flag to check if the Ec has reached its maximum value
//#################################LCD_SETTINGS###############################################
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2; // pin number on arduino
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
//void screen1(int ec,int ph,int temp);
//#################################PH_SETTINGS################################################
#define PHPump 7
float ph=0;
#define SensorPin A6 //pH meter Analog output to Arduino Analog Input 0
#define Offset -9.45 //deviation compensate
unsigned long int avgValue; //Store the average value of the sensor feedback
//################################CHECK_TIMES################################################
long int EC_CheckTime=10000; // 30 seconds
long int PH_CheckTime=12000;
unsigned long int previousMillis = 0;
//################SET_EC&PH####################################################
float setEC=2.7;
float setPH=1;
void setup(){
//***************LCD_SETUP****************
lcd.begin(16,2);
lcd.print("T F C");
//****************EC&TEMP_SETUP*******************
pinMode(TempProbeNegative , OUTPUT ); //seting ground pin as output for tmp probe
digitalWrite(TempProbeNegative , LOW ); //Seting it to ground so it can sink current
pinMode(TempProbePossitive , OUTPUT ); //ditto but for positive
digitalWrite(TempProbePossitive , HIGH );
pinMode(ECPin,INPUT);
pinMode(ECGround,OUTPUT); //setting pin for sinking current
digitalWrite(ECGround,LOW); //We can leave the ground connected permanantly
pinMode(ECPump,OUTPUT);
digitalWrite(ECPump,LOW);
pinMode(PHPump,OUTPUT);
digitalWrite(PHPump,LOW); // gives sensor time to settle
sensors.begin();
delay(100);
R1=(R1+Ra);
//************************************************
Serial.begin(9600);
}
void loop(){
GetEC();
GetPH();
Data(Temperature,finalEC,ph);
screen1(finalEC,ph,Temperature);
delay(5000);
unsigned long currentMillis=millis();
if(currentMillis-previousMillis >= EC_CheckTime && Temperature>0)
{
previousMillis=currentMillis;
if(finalEC<setEC)
{
increaseEC();
}
if(ph>setPH)
{
decreasePH();
}
}
if(Temperature<=0)
{
lcd.clear();
lcd.setCursor(1,0);
lcd.print("Error in Temp!");
lcd.setCursor(1,1);
lcd.print("Waiting....");
delay(200);
}
/*if(currentMillis-previousMillis >= PH_CheckTime)
{
previousMillis=currentMillis;
if(ph>setPH)
{
decreasePH();
delay(5000);
}
}
screen1(finalEC,ph,Temperature);*/
}
//************************************************LCD FUNCTIONS****************************************************************************************************
void screen1(float ec,float ph,float temp){
lcd.clear();
lcd.setCursor(1,0);
lcd.print("EC");
lcd.setCursor(5, 0 );
lcd.print("Ph");
lcd.setCursor(9, 0 );
lcd.print("Temp");
lcd.setCursor(1,1);
lcd.print(ec,1);
lcd.setCursor(5,1);
lcd.print(ph,0);
lcd.setCursor(9,1);
lcd.print(temp,1);
delay(200);
}
//*************************************************************************SERIAL_DATA_TRANSFER*******************************************************************************************
void Data( float a, float b, float c)
{
data1 = a;
data2 = b;
data3 = c;
Serial.print("t ");
Serial.println(data1);
Serial.print("e ");
Serial.println(data2);
Serial.print("p ");
Serial.println(data3);
}
//***************************************************************ELECTRONIC_CONDUCTIVITY********************************************************************************
void increaseEC(void)
{
lcd.clear();
lcd.setCursor(4,0);
lcd.print("EC Low!");
lcd.setCursor(1,1);
lcd.print("Increasing EC..");
delay(200);
digitalWrite(ECPump,HIGH);
delay(5000);
digitalWrite(ECPump,LOW);
}
//****************************************************************
void GetEC(){
//*********Reading Temperature Of Solution *******************//
sensors.requestTemperatures();// Send the command to get temperatures
Temperature=sensors.getTempCByIndex(0); //Stores Value in Variable
//************Estimates Resistance of Liquid ****************//
digitalWrite(ECPower,HIGH);
raw= analogRead(ECPin);
raw= analogRead(ECPin);// This is not a mistake, First reading will be low beause if charged a capacitor
digitalWrite(ECPower,LOW);
delay(10);
//***************** Converts to EC **************************//
Vdrop= (Vin*raw)/1024.0;
Rc=(Vdrop*R1)/(Vin-Vdrop);
Rc=Rc-Ra; //acounting for Digital Pin Resitance
EC = 1000/(Rc*K);
//*************Compensating For Temperaure********************//
EC25 = EC/ (1+ TemperatureCoef*(Temperature-25.0));
finalEC=EC25/10;
finalEC=finalEC*(-1);
;}
//************************************************PH_FUNCTIONS********************************************************************************************
void GetPH(){
int buf[10]; //buffer for read analog
for(int i=0;i<10;i++) //Get 10 sample value from the sensor for smooth the value
{
buf[i]=analogRead(SensorPin);
delay(10);
}
for(int i=0;i<9;i++) //sort the analog from small to large
{
for(int j=i+1;j<10;j++)
{
if(buf[i]>buf[j])
{
int temp=buf[i];
buf[i]=buf[j];
buf[j]=temp;
}
}
}
avgValue=0;
for(int i=2;i<8;i++) //take the average value of 6 center sample
avgValue+=buf[i];
float phValue=(float)avgValue*5/1024/6; //convert the analog into millivolt
ph=8.10*phValue+Offset; //convert the millivolt into pH value
delay(800);
}
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