DSD TECH SH-U09C2 USB to TTL Adapter Built-in FTDI FT232RL IC for Debugging and Programming

I bought the adapter to hook up to a serial port (UART) on a ESP32 development board. Works great. I like the design of the jumper cable.

Works as expected and meets my USB to serial UART needs.

This unit is very well made and comes in a protective see thru case. It has a jumper to select either 3v or 5v device to program. I bought it to program my esp32 camera and it worked great.

This review is for the DSD Tech SH-U09C2. I picked this device up because I didnt have a TTL level adapter for use with embedded device console interfaces or JTAG programming, and wanted to have one around in case I managed to brick one of my routers. The adapter itself is fairly straightforward supporting 5.0v, 3.3v and 1.8v TTL interfaces. The clear case is nice because the device is self-documenting - all of the relevant signals and jumpers are documented on the board. This is good because the included documentation is fairly terse. Then again, if you need one of these adapters you pretty much already know what they are and how to use one so the documentation on the PCB is pretty much all you need. The package also included a loopback jumper for testing adapter operation and a short ribbon cable (about 8in) allowing connection to whatever serial pins are available on the device youre connecting to. There are quite a few additional signals from the FTDI chip that exposed through vias on the PCB that are clearly labeled, but this particular adapter doesnt include attachment pins for them - if needed youd have to open the package and attach pins yourself. The device appears to use a genuine FTDI USB/serial chip - I tried the device using current FTDI VCP drivers on my macbook and the device came right up with no fuss. Ive heard of counterfeit FTDI chips losing chip identifiers when using these drivers, but this device worked just fine for me. The only nit I have is that I picked this one up before I noticed another version of the adapter (slightly more expensive) that included 2.5v and broke out some additional signals. That voltage isnt nearly as common as the voltages this adapter supports, so all in all Im very happy with this device.

I bought this after my prior (allegedgely 3.3V) serial cable stopped working after being connected to a 3.3V system. This is very nicely made -- its enclosed in a clear enclosure (no worries about stray wires shorting out while tinkering) and lets you select 1.8, 3.3, or 5V out (no 2.5, though DSD has another unit that adds 2.5V as well.) A cable is inclued that connects to the I/O header on the end of the USB adapter that is terminated in 1x1 female header pins -- its about a foot long. While Im not a fan of blinky lights, at least youll know this adapter is working. Ive had no issues working with a Raspberry Pi as a console cable and also programmed a 2.5V arduino-type microcontroller successfully. I use Linux and no drivers were required out of the box, just plug an play.

Works very well to flash my Sonoff SV. The build quality of the device is great

Made it easy to connect to serial port header of old wifi router, which allowed me to load open-source firmware (dd-wrt) onto it.