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We are excited to add another product to our growing Adafruit
Bluefruit line, this time it's the Bluefruit EZ-Link Shield: the best
Bluetooth Serial shield ever made. Like you, we have purchased all
sorts of Bluetooth shields with high expectations - we just wanted
something that worked! But nothing ever did exactly what we wanted:
there was always some configuration modes to wade through, and trying
to reprogram an Arduino is impossible.

So we did what we always do, we went in and engineered something
better. Something that works!

The Bluefruit EZ-Link shield is a regular 'SPP' serial link client
device, that can pair with any computer or tablet and appear as a
serial/COM port (except iOS as iOS does not permit SPP pairing). But
here is where it gets exciting: unlike any other BT module, the
EZ-Link can automatically detect and change the serial baud rate. That
means if you open up the COM port on your computer at 9600 baud, the
output is 9600, 57600? 57600. Yep even 2400. All the most common baud
rates are supported: 2400, 4800, 9600, 19200, 38400, 57600, 115200 and
230400. You never have to configure or customize the module by hand -
it all happens completely automatically inside the RF module.

Now if we stopped there, you'd probably think "wow that is pretty
nice" but we didn't stop there! The EZ-Link has another impressive
feature: the DTR/RTS/DSR flow control pins are automatically synced to
the computer serial port. What this means is that if the computer sets
the hardware flow control DTR or RTS pins high or low the pins on the
bluetooth module will follow. If the DSR input pin is brought high or
low on the EZ-Link, the computer can detect that as well. Every other
Bluetooth SPP device we've ever seen, if they even have the RTS/DTR
pins brought out, do not sync back to the computer, instead the flow
control is for the module serial buffer itself.

Together, this creates something pretty amazing: a Bluetooth shield
that can change baud rates on the fly and toggle the DTR pin as
desired. What we've got here now is a way to program an Arduino (or
compatible) from 10 meters away, completely wirelessly, with no extra
software, custom hardware, odd firmware hacks or modified firmware. It
works great, and you can use the serial console as well. It's the only
Bluetooth shield that has completely transparent Arduino
re-programming & communication capability

To round out the design we also added two RX/TX indicator LEDs so you
can tell when data is sent & received as well as a connection status
breakout pin. When the paired computer opens up a UART connection, the
status pin goes high, letting the Arduino know that it can now expect
data to be sent and it's also OK to send data to the computer. You can
use the shield in either Direct mode (the Bluetooth module replaces
the USB/Serial chip) or in Soft Serial mode (you still want to program
over USB but will use SoftwareSerial to communicate with a computer or
other device).

Each order of this EZ-Link shield includes one ready to go and
assembled EZ-Link shield, with FCC/CE/RoHS certification. We also
include a 36-pin header to be used if you want to have the shield plug
in directly into an Arduino. Some light soldering is required! For use
with other shields, we suggest picking up a stacking header kit. Since
the EZ-Link only connects to the RT/TX/Reset Pins for programming, it
will stack with just about any shield in existence.

Works great with Arduino Uno/Duemilanove/compatible and Mega. Not for
use with Leonardo (the Leonardo uses direct-USB instead of USB-Serial)
or Due.

For all the details and tutorials, check out the EZ-Link page at the
Adafruit Learning System [1]



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General information

Manufacturer Adafruit Industries
Product type Elektronikmodul
Item number5998552
Manufacturer no.ada-1628

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Warranty 24 month Bring-in

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Adafruit Industries Adafruit Bluefruit EZ-Link Shield BT Arduino v1.0 Adafruit Industries Adafruit Bluefruit EZ-Link Shield BT Arduino v1.0