Adafruit 2479, Adafruit Wireless Development Kit

The UART makes it easy to add Bluetooth Low Energy connectivity to anything with a hardware or software serial port. We even have nice hardware flow control so you won't have to think about losing data. Connect to your Arduino or other microcontroller or even just a standard FTDI cable for debugging and testing.

Adjusted BLE UART service to use min connection interval as the tx interval
Enabled the internal pullup resistor on the CS pin for Bluefruit SPI boards