Advanced Lesson

Closing Phidgets

In this lesson, you will learn about closing your Phidget.

Write Code (Java)

Copy the code below into the project you created. If you don't have a project or forgot how to create one, revisit the Configure section.

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package gettingstarted;

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

public class GettingStarted {
    public static void main(String[] args) throws Exception{

        //Create
        TemperatureSensor temperatureSensor = new TemperatureSensor();

        //Open
        temperatureSensor.open(1000);

        //Use your Phidgets
        System.out.println("Temperature: " + temperatureSensor.getTemperature() + " °C" );
        
        //Close your Phidgets
        temperatureSensor.close();
    }
}

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

public class GettingStarted {
    public static void main(String[] args) throws Exception{

        //Create
        TemperatureSensor temperatureSensor = new TemperatureSensor();

        //Open
        temperatureSensor.open(1000);

        //Use your Phidgets
        System.out.println("Temperature: " + temperatureSensor.getTemperature() + " °C" );
        
        //Close your Phidgets
        temperatureSensor.close();
    }
}

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

//Define
TemperatureSensor temperatureSensor;

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

void draw(){
  try{
    //Use your Phidgets
    println("Temperature: " + temperatureSensor.getTemperature() + " °C" );
    
    //Close your Phidget
    temperatureSensor.close();
    
    //Exit program
    exit();
    
  }catch(Exception e){
    e.printStackTrace();
  }
}

Write Code (Python)

Copy the code below into the project you created. If you don't have a project or forgot how to create one, revisit the Configure section.

Not your programming language? Set your preferences so we can display relevant code examples

  
 #Add Phidgets Library
from Phidget22.Phidget import *
from Phidget22.Devices.TemperatureSensor import *

#Create
temperatureSensor = TemperatureSensor()

#Open
temperatureSensor.openWaitForAttachment(1000)

#Use your Phidgets
print(" Temperature: " + str(temperatureSensor.getTemperature()) + " °C" )

#Close your Phidgets
temperatureSensor.close()

Write Code (C#)

Copy the code below into the project you created. If you don't have a project or forgot how to create one, revisit the Configure section.

Not your programming language? Set your preferences so we can display relevant code examples

  
//Add Phidgets Library 
using Phidget22;

namespace GettingStarted
{
    class Program
    {
        public static void Main(string[] args)
        {

            //Create 
            TemperatureSensor temperatureSensor = new TemperatureSensor();

            //Open 
            temperatureSensor.Open(1000);

            //Use your Phidgets
            System.Console.WriteLine("Temperature: " + temperatureSensor.Temperature + "°C");

            //Close your Phidgets
            temperatureSensor.Close();

            System.Console.WriteLine("Phidget closed. Press any key to exit.");
            System.Console.ReadKey();
        }
    }
}

Write Code (Swift)

Create a label in your window and copy the code below into the project you created. If you don't have a project or forgot how to create one, revisit the Configure section.

Not your programming language? Set your preferences so we can display relevant code examples

Create a label

  

import Cocoa
//Add Phidgets Library
import Phidget22Swift

class ViewController: NSViewController {
   
   @IBOutlet weak var temperatureLabel: NSTextField!
    
   //Create
   let temperatureSensor = TemperatureSensor()
   
   
   override func viewDidLoad() {
       super.viewDidLoad()
       do{
           //Subscribe to event
           let _ = temperatureSensor.temperatureChange.addHandler(onTemperatureChange)

           //Open
           try temperatureSensor .open()
           
       }catch{
           print(error)
       }
   }
   
   func onTemperatureChange(sender:TemperatureSensor, temperature: Double){
       DispatchQueue.main.async {
           //Use your Phidget
           self.temperatureLabel.stringValue = String(temperature) + "°C"
       }
   }
    @IBAction func closePhidget(_ sender: NSButton) {
        do{
            if(try temperatureSensor.getAttached()){
                try temperatureSensor.close()
                temperatureLabel.stringValue = "Closed"
                sender.title = "Open Phidget"
            }
            else{
                try temperatureSensor.open()
                sender.title = "Close Phidget"
            }
        }catch{
            print(error)
        }
    }
}

Run Your Program

You will see the temperature displayed once and then your program will end.

What Does Closing My Phidget Do?

Closing your Phidget breaks the connection between your code and your physical device. This means that after calling close, your object can no longer be used in your code. Closing will also cause the device to return to its default state. For example, if you were powering an LED, the LED would turn off after closing, or, if you were controlling a motor, the motor would stop spinning after calling close.

When Should I Close My Phidget?

For most classroom projects, you won’t have to worry about closing your Phidgets. You may want to consider adding a close statement in the following situations:

If power is a concern: When Phidgets are in their default state, they use much less power than when they are actively measuring/controlling. If you are using a battery to power your project, you may want to close your Phidget between uses to conserve energy.
If you want to use your Phidget in multiple programs: A Phidget can only be open in one program at a time (unless you are using networked Phidgets). If you want to share the Phidget between multiple programs, you can close it when you are done.
If memory is a concern: Creating objects takes up memory, so if you are only using your Phidget for a short period of time, consider closing the Phidget.

Practice

Try printing temperature from your Phidget after the close call. What error do you get?
Try calling open again after closing your Phidget. Can you print the temperature again?

Practice

Try printing temperature from your Phidget after the close call. What error do you get?
Try calling open again after closing your Phidget. Can you print the temperature again?

Practice

Try printing temperature from your Phidget after the close call. What error do you get?
Try calling open again after closing your Phidget. Can you print the temperature again?

Practice

Are there any new data points after closing the Phidget?
Try calling open again after closing your Phidget. Can you print the temperature again?

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Back to LED Brightness Finish

Closing Phidgets

Write Code (Java)

Write Code (Python)

Write Code (C#)

Write Code (Swift)

Run Your Program

What Does Closing My Phidget Do?

When Should I Close My Phidget?

Practice

Practice

Practice

Practice

What are Phidgets?

Getting Started

Device Tutorials

Projects

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