and not wanting to deal with the cabling involved in a serial to USB adapter, [vahidyou] turned to an ESP8266 to let his computer and device talk wirelessly. The hand-made PCB connects via a 3.5 ...

plugging in a USB to serial module to send the code to the module, standing well back, and pressing upload. For his example image, [CNLohr] has a few WS2812 RGB LEDs connected to the ESP8266 WiFi ...