The USB to serial adapter has a USB-A port on one end and a serial port on the other. The serial port is most commonly RS232, which is a standard that dates back to the 1960s.

Project schematic As seen in the above schematic, a 5-V DC supply from the USB connector (USB) is routed to two 10-Ω/5-W power resistors (R1 and R2) through an SPST switch (S1) followed by an SPDT ...

The Arduino, Bluetooth module (check your specs, some HC-05, and HC-06 may come on a breakout board expecting 5V), and USB Host shield all run off of 3.3V, but devices you want to plug into the ...

USB To Quad Serial Port Adapter Offers TTL, Isolated Ports February 10, 2018 by Richard Baguley 30 Comments ...

The Devolinx UTS-402CK is an industrial USB to 2-port RS-232/422/485 converter with locking feature. The UTS-402CK is designed for PCs, thin clients, or servers to provide instant COM port expansion ...

This came to us via hardware hacking site Hack A Day. The driver in question is for a line of USB-to-serial chips designed by Scottish firm FTDI.

So he tried his hand with some really small SMD parts by building this USB to serial Arduino programmer. The chip he went with isn’t the FTDI part we’re used to.