PDAs, Bluetooth & Wireless

PDAs

PDAs or handheld computers stand for Personal Digital Assitant. These are portable computers which enable us to communicate and record information. They're used especially by doctors and proffessionals.

Advantages:-

* They're portable; remote use from places of work.

* They're easily carried.

Disadvantages:-

* It is a bit difficult to enter text.

* They're as much expensive as laptops.

 

These days, no one uses PDAs becuase it is old-styled and there're other alternatives which are better than PDAs like smartphones and advanced PMPs.

 

 

 

 

 

 

Bluetooth and WiFi

Bluetooth:-

Bluetooth is a wirless connection between two devices of a range less than 10 meters. It is used to transfer files & data from one device to another through radio waves. It is completely automatic and easy to use. It also consumes little power and has cheap hardware requirements. Even today, it is used very commnly among the people.

 

 

 

 

 

 

 

WiFi:-

WiFi stands for Wirless Fidelity is an alternative to Bluetooth. It covers as much distance required and it is faster than Bluetooth. It is a trademark which is used worldwide. Many application work via WiFi for free which are useful in our daily life.  It can be used to access the internet, send e-mails, download media from the internet. Devices are connected via Wi-Fi through an access point. Wi-Fi is available in almost everywhere including personal homes, hotels, public hotspots, etc...

 

Surely there're other ways to connect like the IR (Infrared Radiation). This is the earliest method so far to connect two devices in a very; very small distances.

 

 

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GPS (Between the Past and the Present)

GPS

 

First Model:-

The first model was develped in 1973. It was created and realized by the US Deparment of Defense. It became fully operational in 1994.

Old GPS Model:-

The old GPS model's concept was only to locate the user using satellite navigation. They were used by drivers mostly to produce route for their cars or lorries. The main advantage of this model is that it is faster than the a normal road map and the recieve up-to-date traffic conditions. The problem was that the display was very small.

Later GPS Designs:-

Later designs were introduced in the market. They had a lot of extra features comparing to the earliest model. The display has improved a lot as it got wider and better. Voice guiding was introduced in these devices which made tracking easier. These devices also had applications like the clock, timer, stopwatch, games and etc...

 Modern GPS Designs:-

Today, GPS can be found almost everywhere: in cars, smartphones, watches, etc... The GPS technology has improved so much. The quality is rich, display is excellent and it is also very accurate in locating. The features are tripplled and more applications have been added. In smartphones, GPS is an application which can be used to show drivers & pedestriants the routes and alternative path in case of traffic jam. Still, it has to updated every now and then to provide its user with accurate information about the locations.

(This is an example of GPS in a car.)

Future Designs:-

Companies are still working to develp a brand new desgin for GPS with extra features and accessories for a better tomorrow.

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Portable Entertainment Devices

Portable Entertainment Devices

 

1st: Portable DVD Player

Advantages:-

* They can be used outdoors in remote areas.

* They can play music, videos from CDs.

* They can be used as radios.

* They're entertaining

Disadvantages:-

* The quality of videos and recording audio is poor.

* They are not useful for group viewing

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2nd: Portable Media Player

Advantages:-

* They can be used outdoors.

* They can be used as radios

* They can play media (videos & music)

* They can hold data more than 100GB

(An example for modern PMP devices is iPod Touch.) 

 

Disadvantages:-

* They've small screens

* The quality is poor

* They're easily damaged

(An iPod doesn't include the disadvantages above)

 

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Mobile Phones

Mobile Phones

Mobile Phones are portable communication devices which enable us to communicate with people in distant areas.

The main features of modern mobile phones are:-

1) Make personal, business or international phone calls.

2) Send text messages (SMS)

3) Wi-Fi Connection

4) E-mail

5) Bluetooth and other connections

6) Entertainment purposes like: playing games, watching movies, listening to music and viewing photos.

7) Applications like: calendar, alarms, tasks and memos.

8) Other communication applications like: Whatsapp, Viber and Voxer.

9) Photo Capture and Video Recording 

 

3) Wi-Fi Connection

Wi-Fi is a modern feature which allows communication devices to exchange information and data. It can be used to access the internet, send e-mails, download media from the internet and it even supports some applications to provide phone calls and messages free of charge. Devices are connected via Wi-Fi through an access point. Wi-Fi is available in almost everywhere including personal homes, hotels, public hotspots, etc...

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