There’s Wi-Fi, Bluetooth, a 3-axis accelerometer and four buttons that can be used ... if you want to make any changes to the watch face you’ll have to download the Arduino IDE and program ...

We assume that would mean if you wanted to build it into a product, not just provide an interface to it. This seems like something Arduino expects, because a lot of the command line tools can ...

We’re all familiar ... that supporting circuitry. To make that transition easier, [Sean Hodgins] has come up with a simple Arduino-compatible module that can be soldered right to a PCB.