11-03-2011, 03:50 PM
Submitted by
Y.SWARNALATHA
[attachment=10015]
1. INTRODUCTION
The Java Ring is a stainless-steel ring, 16-millimeters (0.6 inches) in diameter that
houses a 1-million-transistor processor, called an iButton. The ring has 134 KB of
RAM, 32 KB of ROM, a real-time clock and a Java virtual machine, which is a piece
of software that recognizes the Java language and translates it for the user's computer
system.
At Celebration School, the rings have been programmed to store electronic cash to pay
for lunches, automatically unlock doors, take attendance, store a student's medical
information and allow students to check out books. All of this information is stored on
the ring's iButton. Students simply press the signet of their Java Ring against the Blue
Dot receptor, and the system connected to the receptor performs the function that the
applet instructs it to. In the future, the Java Ring may start your car.
Mobile computing is beginning to break the chains that tie us to our desks, but many of
today's mobile devices can still be a bit awkward to carry around. In the next age of
computing, we will see an explosion of computer parts across our bodies, rather than
across our desktops. Digital jewelry, designed to supplement the personal computer,
will be the evolution in digital technology that makes computer elements entirely
compatible with the human form.
The Java Ring, first introduced at Java One Conference, has been tested at Celebration
School, an innovative K-12 school just outside Orlando; FL.The rings given to students
are programmed with Java applets that communicate with host applications on
networked systems. Applets are small applications that are designed to be run within
another application. The Java Ring is snapped into a reader, called a Blue Dot receptor,
to allow communication between a host system and the Java Ring.
2. HISTORY
In the summer of 1989, Dallas Semiconductor Corp. produced the first stainless-steel-
encapsulated memory devices utilizing the Dallas Semiconductor 1-Wire communication
communication protocol. By 1990, this protocol had been refined and employed in a
variety of self-contained memory devices. Originally called "touch memory" devices,
they were later renamed "iButtons." Packaged like batteries, iButtons have only a single
active electrical contact on the top surface, with the stainless steel shell serving as
ground.
Data can be read from or written to the memory serially through a simple and
inexpensive RS232C serial port adapter, which also supplies the power required to
perform the I/O. The iButton memory can be read or written with a momentary contact
to the "Blue Dot" receptor provided by the adapter. When not connected to the serial
port adapter, memory data is maintained in non-volatile random access memory
(NVRAM) by a lifetime lithium energy supply that will maintain the memory content
for at least 10 years. Unlike electrically erasable programmable read-only memory
(EEPROM), the NVRAM iButton memory can be erased and rewritten as often as
necessary without wearing out. It can also be erased or rewritten at the high speeds
typical of complementary metal oxide semiconductor (CMOS) memory, without
requiring the time-consuming programming of EEPROM.
Since their introduction, iButton memory devices have been deployed in vast quantities
as rugged portable data carriers, often in harsh environmental conditions. Among the
large-scale uses are as transit fare carriers in Istanbul, Turkey; as maintenance record
carriers on the sides of Ryder trucks; and as mailbox identifiers inside the mail
compartments of the U.S. Postal Service's outdoor mailboxes. They are worn as earrings
by cows in Canada to hold vaccination records, and they are used by agricultural
workers in many areas as rugged substitutes for timecards.
Y.SWARNALATHA
[attachment=10015]
1. INTRODUCTION
The Java Ring is a stainless-steel ring, 16-millimeters (0.6 inches) in diameter that
houses a 1-million-transistor processor, called an iButton. The ring has 134 KB of
RAM, 32 KB of ROM, a real-time clock and a Java virtual machine, which is a piece
of software that recognizes the Java language and translates it for the user's computer
system.
At Celebration School, the rings have been programmed to store electronic cash to pay
for lunches, automatically unlock doors, take attendance, store a student's medical
information and allow students to check out books. All of this information is stored on
the ring's iButton. Students simply press the signet of their Java Ring against the Blue
Dot receptor, and the system connected to the receptor performs the function that the
applet instructs it to. In the future, the Java Ring may start your car.
Mobile computing is beginning to break the chains that tie us to our desks, but many of
today's mobile devices can still be a bit awkward to carry around. In the next age of
computing, we will see an explosion of computer parts across our bodies, rather than
across our desktops. Digital jewelry, designed to supplement the personal computer,
will be the evolution in digital technology that makes computer elements entirely
compatible with the human form.
The Java Ring, first introduced at Java One Conference, has been tested at Celebration
School, an innovative K-12 school just outside Orlando; FL.The rings given to students
are programmed with Java applets that communicate with host applications on
networked systems. Applets are small applications that are designed to be run within
another application. The Java Ring is snapped into a reader, called a Blue Dot receptor,
to allow communication between a host system and the Java Ring.
2. HISTORY
In the summer of 1989, Dallas Semiconductor Corp. produced the first stainless-steel-
encapsulated memory devices utilizing the Dallas Semiconductor 1-Wire communication
communication protocol. By 1990, this protocol had been refined and employed in a
variety of self-contained memory devices. Originally called "touch memory" devices,
they were later renamed "iButtons." Packaged like batteries, iButtons have only a single
active electrical contact on the top surface, with the stainless steel shell serving as
ground.
Data can be read from or written to the memory serially through a simple and
inexpensive RS232C serial port adapter, which also supplies the power required to
perform the I/O. The iButton memory can be read or written with a momentary contact
to the "Blue Dot" receptor provided by the adapter. When not connected to the serial
port adapter, memory data is maintained in non-volatile random access memory
(NVRAM) by a lifetime lithium energy supply that will maintain the memory content
for at least 10 years. Unlike electrically erasable programmable read-only memory
(EEPROM), the NVRAM iButton memory can be erased and rewritten as often as
necessary without wearing out. It can also be erased or rewritten at the high speeds
typical of complementary metal oxide semiconductor (CMOS) memory, without
requiring the time-consuming programming of EEPROM.
Since their introduction, iButton memory devices have been deployed in vast quantities
as rugged portable data carriers, often in harsh environmental conditions. Among the
large-scale uses are as transit fare carriers in Istanbul, Turkey; as maintenance record
carriers on the sides of Ryder trucks; and as mailbox identifiers inside the mail
compartments of the U.S. Postal Service's outdoor mailboxes. They are worn as earrings
by cows in Canada to hold vaccination records, and they are used by agricultural
workers in many areas as rugged substitutes for timecards.
