Isn’t that nice? The CH340 series of chips do exactly what you would expect them to do: a full-speed USB device that emulates a standard serial interface, with speeds from 50bps to 2Mpbs.

Learn what a USB to Serial adapter is used for, when you might need one, and whether installing a driver is required for it ...

The USB cable is used to power ... using the SerialChiller as a simple serial to WiFi bridge, [Lasse] is actually implementing a complete web-based interface directly on the microcontroller.