Our Adafruit Bluefruit LE (Bluetooth Smart, Bluetooth Low Energy,
Bluetooth 4.0) nRF8001 Breakout allows you to establish an easy to use
wireless link between your Arduino and any compatible iOS or Android
It works by simulating a UART device beneath the surface, sending
ASCII data back and forth between the devices, letting you decide what
data to send and what to do with it on either end of the connection.
Unlike classic Bluetooth, BLE has no big contracts to sign and no
major hoops that you have to jump through to create iOS peripherals
that you can legally design and distribute in the App Store, which
makes it a great choice compared to classic Bluetooth which had (and
still has) a lot of restrictions around it on the iOS platform.
And now that Android also officially supports Bluetooth Low Energy
(as of Android 4.3), it's also -- finally! -- a universal
communication channel covering the main mobile operating systems
people are using today.
We can get you started super fast with this BLE module which can act
like an 'every day' UART data link (with an RX and TX characteristic).
Send and receive data up to 10 meters away, from your Arduino to an
iOS device. We've even made it easy to get started with our very own
BLE connect app that has a "serial console" for sending/receiving data
and also an \'arduino pin i/o control station"  to let you set pins
on your Arduino to inputs or outputs, high or low logic or even PWM
output, as well as read button presses and analog inputs. You can
start prototyping your accessory and then use our open source
Objective C code to base your new app on! 
The nRF8001 is nice in that it is just a BLE 'peripheral' (client)
front-end, so you can use any micrcontroller with SPI to drive it. We
have example C++ code for Arduino, which you can port to any other
microcontroller, but some microcontroller is required - it is not a
Please note: There is not an Android version of the Adafruit
Bluefruit LE App available (our native BLE application) at this
time,however you can use Nordic's Android nRF UART application with
the nRF8001 Breakout on BLE capable Android devices (Nexus 4, Nexus 5,
Nexus 7, etc.) for sending/receiving data. This is a product for
ADVANCED USERS - At this time we recommend this product for people who
are either OK with using the apps available (Nordic's UART demo or our
Bluefruit LE Connect) or are comfortable with writing iOS apps (and
can refer to our App repository). We do not have a tutorial for
writing your own iOS or Android BLE app at this time, don't worry
we're working on one :)
We have a guide to help you setup your nRF8001 Bluetooth Low Energy
breakout, and start using some of the sample sketches we provide with
it to connect to an iOS or Android device. 
* Dimensions: 29mm x 28mm / 1.14" x 1.10"
* 1mm thick / .04"
* Weight: 1.8g
http://learn.adafruit.com/getting-started-with-the-nrf8001-bluefruit-le-breakout … more
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