For this project, you will need the components mentioned in the following list. All the components listed can be swapped for similar components, and in Figure 9.1, you will find the components I used. If you do swap the components, make sure that you keep track of the dimensions of your components. The design for the watch in this book is based on the components shown in Figure 9.1 and leaves very little room for modification since we are trying to achieve as small a casing as possible.
A Particle Core board
A 3.7V lithium battery
An Adafruit 128 inch x 64 inch OLED screen
An Adafruit Battery charging circuit
A 1 mm plastic sheet material
Leather or heavy duty material, at least 30 cm x 10 cm
A soldering iron
An Exacto knife
Leather sewing awls and heavy duty thread
Eyelets and an eyelet tool
A mini breadboard
Figure 9.1: The components needed for the smart watch
If you want to pack the full punch with your watch, you could consider including a GPS, however this will make the design much bulkier...