pH Phidget

The pH Phidget measures the pH of a liquid. pH is a measure of how acidic or basic (alkaline) a water-based solution is.

The pH scale runs from 0 (very acidic) to 14 (very basic)—7 being neutral. For example, vinegar is acidic, with a pH generally around 2.4. Baking soda dissolved into water will have a pH of approximately 9.3.

See tutorial

Setup

Before you do any coding you will have to attach you pH electrode to your Phidget and your Phidget to your VINT Hub as shown:

Code (Java)

Create a file called PH and insert the following code. Run your code. Place your electrode in a glass of water to see the pH.

Not your programming language? Set my language and IDE.

  
package ph;

//Add Phidgets Library
import com.phidget22.*;

public class PH{
    public static void main(String[] args) throws Exception{
        
	//Create
        PHSensor phSensor = new PHSensor();

        //Open
        phSensor.open(1000);
        
        //Use your Phidgets
        while(true){
            System.out.println("pH: " + phSensor.getPH()+ " pH");
            Thread.sleep(250);
        }
    }
}
  
  
//Add Phidgets Library
import com.phidget22.*;

public class PH{
    public static void main(String[] args) throws Exception{
        
	//Create
        PHSensor phSensor = new PHSensor();

        //Open
        phSensor.open(1000);
        
        //Use your Phidgets
        while(true){
            System.out.println("pH: " + phSensor.getPH()+ " pH");
            Thread.sleep(250);
        }
    }
}
  
  
//Add Phidgets Library
import com.phidget22.*;

//Define
PHSensor phSensor;

void setup(){
  try{
    
    //Create 
    phSensor = new PHSensor();
    
    //Open
    phSensor.open(1000);
    
  }catch(Exception e){
    e.printStackTrace();
  }
}

void draw(){
  try{
    
    //Use your Phidgets
    println("pH: " + phSensor.getPH()+ " pH");
    delay(250);
    
  }catch(Exception e){
    e.printStackTrace();
  }
}
  

Code (Python)

Create a file called PH and insert the following code. Run your code. Place your electrode in a glass of water to see the pH.

Not your programming language? Set my language and IDE.

  
#Add Phidgets Library
from Phidget22.Phidget import *
from Phidget22.Devices.PHSensor import *
#Required for sleep statement
import time

#Create
phSensor = PHSensor()

#Open
phSensor.openWaitForAttachment(1000)

#Use your Phidgets
while(True):
    print("PH: " + str(phSensor.getPH()) + " pH")
    time.sleep(0.25)
  

Code (C#)

Create a file called PH and insert the following code. Run your code. Place your electrode in a glass of water to see the pH.

Not your programming language? Set my language and IDE.

  
//Add Phidgets Library
using Phidget22;
namespace PH{
    class Program{
        static void Main(string[] args){

            //Create
            PHSensor phSensor = new PHSensor();

            //Open
            phSensor.Open(1000);

            //Use your Phidgets
            while (true)
            {
                System.Console.WriteLine("pH: " + phSensor.PH + " pH");
                System.Threading.Thread.Sleep(250);
            }
        }
    }
}
  

Code (Swift)

Create a file called PH and insert the following code. Run your code. Place your electrode in a glass of water to see the pH.

Not your programming language? Set my language and IDE.

  
import Cocoa
//Add Phidgets Library
import Phidget22Swift

class ViewController: NSViewController {

    @IBOutlet weak var sensorLabel: NSTextField!
    
    //Create
    let pHSensor = PHSensor()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        do{
            //Subscribe to event
            let _ = pHSensor.PHChange.addHandler(onPHChange)
            
            //Open
            try pHSensor.open()
        }catch{
            print(error)
        }
    }
    
    func onPHChange(sender:PHSensor, pH:Double){
        DispatchQueue.main.async {
	    //Use information from your Phidget to change label
            self.sensorLabel.stringValue = String(pH) + " pH"
        }
    }
}
  

Applications

pH monitoring has several scientific and industrial applications. pH sensors monitor titration experiments or other chemistry applications. Fermented foods use pH monitoring to ensure consistency and proper fermentation. Farms use pH sensors to watch the pH of the soil to ensure maximum crop success.

You may notice some soaps and skincare products list the pH. The pH of a product can influence the dryness and bacteria found on the skin.

Practice

You can use your Getting Started Kit and pH Phidget to create a pH indicator.

  1. Attach the pH Phidget to the VINT Hub in your Getting Started Kit.
  2. Write a program that uses your LEDs to indicate if a solution is acidic or basic and test it with some vinegar or a baking soda solution.

Check out the advanced lesson Using the Sensor API before you use the API for the first time.

API
Troubleshoot
  1. Make sure everything is plugged in properly and your VINT Hub is connected to your computer
  2. Stop running other programs that are using your Phidgets before running a program.

If these do not solve your issue visit the Advanced Troubleshooting Page.

What are Phidgets?

Phidgets are programmable, modular USB devices, either sensors or controllers that you can connect together. Simply write code in your favorite language and solve real-world problems.

Learn more

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