The world needs more blinky lights, and [Bertus Kruger] has created a neat way to make lights blink wirelessly. He has a footprint in the middle of the board for soldering the castellated ESP8266 m… ...

As usual I’ll be using a NodeMCU board (I really did order a lot of them) which uses an ESP8266, but there’s no reason this would be difficult to achieve on an Arduino-based device.