Arduino wifi is one of the many wireless devices that can connect us to the Arduino wifi is short for Wireless Fidelity, which has the sense of a set of standards used for Wireless Local Networks (Wireless Local Area Networks - WLANs) based on the IEEE 802.11. The latest standards of specification 802.11a or b, such as 802.16 g, is currently in preparation, the latest specification will offer many improvements ranging from a more extensive coverage to the transfer speed.
Arduino wifi was originally intended for the use of wireless devices and Local Area Network (LAN), but now more widely used to access the Internet. This allows anyone with a computer with a wireless card (wireless card) or personal digital assistants (PDAs) to connect to the internet using access point (otherwise known as hotspots) nearby.
Arduino wifi was designed based on the IEEE 802.11 specification. Today there are four variations of 802.11, namely:
* 802.11a
* 802.11b
* 802.11g
* 802.11n
B is the first product specifications Arduino wifi. Variations in g and n is one product that has the most sales in 2005.
In many parts of the world, the frequencies used by Arduino wifi, users are not required to obtain permission from local regulators (eg, Federal Communications Commission in the U.S.). 802.11a uses a higher frequency and therefore its range is narrower, more equal.
Arduino wifi version of the most extensive in the U.S. market today (based in IEEE 802.11b / g) operates at 2400 MHz to 2483.50 MHz. With so allows operation in 11 channels (each 5 MHz), centered on the following frequencies:
* Channel 1 to 2.412 MHz;
* Channel 2 to 2.417 MHz;
* Channel 3 to 2.422 MHz;
* Channel 4 to 2.427 MHz;
* Channel 5 to 2.432 MHz;
* Channel 6 to 2.437 MHz;
* Channel 7 to 2.442 MHz;
* Channel 8 to 2.447 MHz;
* Channel 9 to 2.452 MHz;
* Channel 10 to 2.457 MHz;
* Channel 11 to 2.462 MHz
Technically operational, Arduino wifi is one variant of communications and information technology that works on the network and device WLAN (wireless local area network). In other words, the Arduino wifi is a certification trademark given to telecommunications equipment manufacturers (Internet) working in WLAN networks and interoperates capacity already meets the required quality.
Technology-based Arduino wifi internet created and developed a group of U.S. engineers who worked on Electronis Institute of Electrical and Electronics Engineers (IEEE) is based on the number of technical standards 802.11b, 802.11a and 802.16. Arduino wifi devices are not only able to work on WLAN networks, but also on network Wireless Metropolitan Area Network (WMAN).
Because the device with the technical standards 802.11b WLAN devices intended for use in the 2.4 GHz frequency or frequencies, commonly called ISM (Industrial, Scientific and Medical). As for the technical standards of 802.11a and 802.16 WMAN or destined for the device is also called Wi-Max, who works in the vicinity of 5 GHz frequency band.
The high public interest - particularly among the Internet community - using Arduino wifi technology because at least two factors. First, the ease of access. That is, users in one area can access the Internet simultaneously without the need to be bothered with cables.
Consequently, users who want to do surfing or browsing news and information on the Internet, simply bring the PDA (pocket digital assistance) or Arduino wifi enabled laptop into a place where there is access point or hotspot.
The proliferation of hotspots in places - which was built by the telecom operators, Internet service providers and even individuals - triggered a second factor, namely due to construction costs are relatively cheap or just around 300 dollars U.S..
Increasing the quantity of Internet users based Arduino wifi technology is increasingly implicated in various parts of the world, has encouraged Internet service providers (ISPs) to build hotspots in major cities of the world.
Some observers have even predicted in 2006, there will be 800,000 hotspots in the countries of Europe, 530,000 in the United States and one million in countries in Asia.
The overall amount of income derived by the United States and European countries from the Internet-based business technology Arduino wifi until the end of 2003 was estimated at 5.4 trillion U.S. dollars, an increase of 33 billion U.S. dollars from the year 2002 (www.analysys.com).
In Indonesia alone, the use of Internet-based Arduino wifi is already implicated in several major cities. In Jakarta, for example, the maniacs who are surfing the Internet while waiting for the plane take off in an airport lounge, is not a foreign thing.
The same phenomenon is seen in various cafes - like a Starbucks Cafe and La Moda Cafe, Plaza Indonesia, Senayan Coffee Club, and Cafe Coffee Bean in Cilandak Town Square - where visitors can see the open Internet for political news or gossip while sipping a cappuccino newest artist hot .
Today, business telephone-based VoIP (Voice over Internet Protocol) has also been using Arduino wifi technology, in which telephone calls routed via the WLAN network. The application is named VoArduino wifi (Voice over Arduino wifi).
Some time ago, the latest technical standards created by IEEE has been able to support the operation of video streaming services. Even predictable, can later be made card (card)-based Arduino wifi technology that can be inserted into electronic equipment, ranging from digital cameras to video game consoles (ITU News 8 / 2003).
Based on the above explanation, it can be concluded that the quantity of business and technology users tend to increase Arduino wifi, and economically it positive implications for the national economy of a country, including Indonesia.
Nonetheless, the government should be addressing the phenomenon wisely and carefully. The reason is, technologically frequency bands - both 2.4 GHz and 5 GHz - which became operational container technology Arduino wifi is not free of limitations (Kompas, 2/5/2004).
Because the users in a new area can take advantage of wireless Internet system is optimally, when all the devices used in the area using a uniform transmit power and limited.
If these preconditions are not heeded, will certainly take place harmful interference between devices is not just Internet users, but also with other telecommunications systems devices.
If the interference persists - because users want more superior than other users, and hence a lack of understanding of the limitations of the technology - will ultimately make the frequency bands 2.4 GHz and 5 GHz could not be utilized optimally.
Another limitation of the second wireless frequency channels (particularly 2.4 GHz) is because it is also used for ISM (industrial, science and medical).
Consequently, the use of radio communications or other telecommunication device that works on the frequency band it should be ready to accept interference from ISM devices, as stated in S5.150 of the Radio Regulations.
In ITU-R recommendation SM.1056, also informed the ISM device characteristics which basically aims to prevent interference, both between the ISM and other woods with a telecommunications device.
The same recommendation affirms that every member of the ITU-free set of administrative requirements and rules of law relating to mandatory power restrictions.
Recognizing the limitations and the impact that may arise from the use of both the wireless frequency bands, different countries and impose regulations that limit the emittance device