My Setup

At the moment i use the following hardware and parts to develope the arduino smartwatch communicating with my windows phone 8.1

Hardware:

• Arduino Mini Pro (ATmega 328, 3.3V, 8Mhz, 2kb SRAM)
• Arduino UNO R3 (i use it as ISP programmer to flash code to the Arduino Mini Pro)
• 1.3" OLED Display (monochrome, 128x64, graphic display) --> Tutorial
• HC-06 Bluetooth Modul (3.3 V)
• Nokia Lumia 620 (Windows Phone 8.1)
• Pushbutton + 10kOhm resistor
• Breadboard and some wires....

Arduino Libraries (non standard):

• Adafruit_SSD1306 
• Adafruit-GFX

Software:

• Arduino IDE
• Microsoft Visual Studio Express 2012 for Windows Phone 8

Debugging Tools:

• Zeroplus LAP-C 16032 Logic Analyzer (ordered)