Want to make a project/robot/device which can communicate with other devices or your smartphone? The Bluefruit LE Micro makes it a breeze. This board is basically an Arduino with Bluefruit LE SPI Friend. All you need to do is connect the board to the computer via USB port and program the board using Arduino IDE.
Bluetooth Low Energy is the hottest new low-power, 2.4GHz spectrum wireless protocol. It's on all the talk shows, it's featured on the cover of Vogue, it even has it's very own perfume! OK, maybe that stuff isn't completely true. But it isa very exciting way to have your electronic projects communicate with a BLE-capable computer, tablet or phone.
In particular, its the only wireless protocol that you can use with iOS without needing special certification and it's supported by all modern smart phones. This makes it excellent for use in portable projects that will make use of an iOS or Android phone or tablet.
ATmega32u4 Microcontroller used in the Bluefruit LE Micro is the same chip used in Arduino Leonardo and Flora however it runs at 8Mhz on 3.3V logic to make it compatible with majority of sensors in the market. It has 20+ GPIO pins, including I2C, SPI, a UART, and 6 analog inputs. It has 28KB of FLASH available for your program, and 2KB of RAM. And, of course, native USB for programming and communication.
The Bluefruit LE module is an nRF51822 chipset from Nordic, programmed with multi-function code. This module has SPI interface for communication and debugging/testing.Introducing Bluefruit LE Micro tutorial by Adafruit