Interfacing PH sensor with Arduino

 Hi friends in this section we talk about the Interfacing PH sensor with Arduino. click here to know more about PH

Interfacing PH sensor with Arduino video :

code :

#define SensorPin 0          // the pH meter Analog output is connected with the Arduino’s Analog

unsigned long int avgValue;  //Store the average value of the sensor feedback

float b;

int buf[10],temp;

void setup()

{

  pinMode(13,OUTPUT);  

  Serial.begin(9600);  

  Serial.println("Ready");    //Test the serial monitor

}

void loop()

{

  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])

      {

        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*5.0/1024/6; //convert the analog into millivolt

  phValue=3.5*phValue;                      //convert the millivolt into pH value

  Serial.print("    pH:");  

  Serial.print(phValue,2);

  Serial.println(" ");

  digitalWrite(13, HIGH);       

  delay(800);

  digitalWrite(13, LOW); 

} 

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