Quantity   Component name
1 × IMUduinoBTLE The latest from Femtoduino, the IMUduinoBTLE uses an atmega32u4 from Atmel bootloaded as an Arduino Leonardo and a Nordic nRF8001 bluetooth 4.0 low energy chip and support components to connect to compliant devices and receive notifications for the watch. It’s tiny size and low power consumption make it perfect for use in this low power application. Now with an on board IMU, the IMUduinoBTLE has 10 DOF IMU incorporating a 10cm accurate barometer/altimeter, 6-axis digital compass, and 3-axis gyroscope/accelerometer, enabling complex motion and the precise altitude to be implemented by the user!
1 × 1.5″ full color OLED display with onboard microSD card slot from Mike Rankin A step up from the monochrome .96″ OLED display of v4.2, this screen also consumes very little power thanks to the OLED technology behind it and can show beautiful images that will be the GUI for the smart watch. Now that there’s an sd card on board, I can use fancy graphics and make it look professional and keep the code to the microcontroller, enabling more to be coded instead of storing images too.
1 × 3D Pedometer Module from Nicerf This tiny, tiny module will connect to the watch’s I2C lines as the DS1307 does, and counts steps using a tiny accelerometer and buffer memory. It’ll be used to add fitness tracking capability to the watch and in conjunction with the phone app, keep track of calories burned and activity levels! Oh, and did I say this thing was tiny?
1 × Samsung NFC Tec Tile An advanced NFC tag that when placed under the OLED screen's glass, will allow users to scan the watch with their phones and automatically connect themselves to it via bluetooth, and open up a web page with documentation and source code!
1 × QI Inductive Power Receiver Made for the Galaxy S5, this small card with an embedded coil receives up to 750ma at 5V from a QI compatible base station to charge the watch's lithium ion battery wirelessly.
1 × DS1307 RTC A trusty real time clock, forms the backbone of the timekeeping functionality a watch is useful for.
1 × MCP73831 Charge Controller Charges the battery and provides charge status information.
1 × 500mAh Lithium Polymer Battery The battery that powers the watch. With how things are looking, an 18-24 hour battery life is to be expected.
1 × Flickable Side-Mounted Selector Switch
1 × Vibration Motor for feedback