TinyCircuits TinyShield Bluetooth Low Energy (BLE)

This TinyShield is based around the Bluegiga BLE112 module and lets
you connect your projects using Bluetooth 4 Low Energy (also known as
Bluetooth Smart), which is supported on newer phones (like the iPhone
4s, and 5). This technology is great for low power sensors and
accessories.

Includes power supply and level shifters on the board, so you can run
your TinyDuino from 3.3V - 5V.

Specifications:

* Bluetooth v. 4.0, single mode compliant

* Supports master and slave modes
* Supports up to eight connections

* Integrated Bluetooth Smart stack

* GAP, GATT, L2CAP, SMP
* Bluetooth Smart profiles

* Radio performance

* TX power: +3 dBm to -23 dBm
* Receiver sensitivity: -93 dBm

* Ultra low current consumption

* Transmit: 27mA (0 dBm)
* Sleep mode 3: 0.5 uA

* Ultra compact size and weight

* Rectangular Version: 20mm x 29mm (.787 inches x 1.142 inches)
* Max Height (from lower bottom TinyShield Connector to upper top
TinyShield Connector): 5.11mm (0.201 inches)
* Weight: TBD grams (TBD ounces)

* UART Mode used

* Arduino pins 0 - 1 used by this shield (the standard hardware UART
lines)

* Built in level shifters and linear power supply to allow your
TinyDuino to run up to 5.0V operation.

To see what other TinyShields this board can be used with at the same
time with, see the TinyShield Compatibility Matrix [1] Tutorial @
Tiny-Circuits: Learn how to use the Bluetooth LE TinyShield [2]

Links:

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[1] https://tiny-circuits.com/tinyshield-compatibility/
[2]
http://tiny-circuits.com/learn/using-the-bluetooth-low-energy-tinyshield/