There are plenty of smartwatches on the market. Not everyone is ready to spend a couple of hundred dollars to get a new smartwatch. Wouldn’t it be nice if you could build your own for about $125? Jonathan Cook has shared an open source smartwatch that you can make with a 3D printed frame, an OLED display, a vibrating motor, and an Arduino compatible core. You can find the relevant information here. Worth trying for Arduino hackers or anyone hoping to learn this stuff.