This guy built his own smartwatch and so can you
 

DIY projects can be a lot of fun, and if Raspberry Pi has taught us anything it's that people love to tinker. But for most folk, forays into the world of build-it-yourself tech start and end with a specific kit and a whole bunch of instructions to he...

https://www.engadget.com/2019/05/01/...-from-scratch/