Analog pH Meter V1.0

Need to measure water quality and other parameters but haven't got any low cost pH meter? Find it difficult to use with Arduino? Here comes an analog pH meter, specially designed for Arduino controllers and has built-in simple, convenient and practical connection and features. It has an LED which works as the Power Indicator, a BNC connector and PH2.0 sensor interface. To use it, just connect the pH sensor with BNC connector, and plug the PH2.0 interface into the analog input port of any Arduino controller. If pre-programmed, you will get the pH value easily. Comes in compact plastic box with foams for better mobile storage.

Applications

• Water quality testing
• Aquaculture

Quick Spec

• Module Power : 5.00V
• Module Size : 43mm×32mm
• Measuring Range:0-14PH
• Measuring Temperature :0-60 ℃
• Accuracy : ± 0.1pH (25 ℃)
• Response Time : ≤ 1min
• pH Sensor with BNC Connector
• PH2.0 Interface ( 3 foot patch )
• Gain Adjustment Potentiometer
• Power Indicator LED

Wiring Diagram

Code Example

/*
# This sample codes is for testing the pH meter V1.0.
 # Editor : YouYou
 # Date   : 2013.10.21
 # Ver    : 0.1
 # Product: pH meter
 # SKU    : SEN0161
*/

#define SensorPin 0          //pH meter Analog output to Arduino Analog Input 0
#define Offset 0.00            //deviation compensate
unsigned long int avgValue;    //Store the average value of the sensor feedback

void setup()
{
  pinMode(13,OUTPUT);  
  Serial.begin(9600);  
  Serial.println("Ready");    //Test the serial monitor
}
void loop()
{
  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*5.0/1024/6; //convert the analog into millivolt
  phValue=3.5*phValue+Offset;                      //convert the millivolt into pH value
  Serial.print("    pH:");  
  Serial.print(phValue,2);
  Serial.println(" ");
  digitalWrite(13, HIGH);       
  delay(800);
  digitalWrite(13, LOW); 
}

Resources

• Product Page
• Product Wiki
• Schematic
• PH Composite Electrode Manual

Shipping List

• 1 x Analog pH Meter V1.0