USB Serial Port Control Relay Module Sturdy Durable Lightweight USB Relay Module USB Intelligent Control Switch Overcurrent Protection Intelligent Command Control Switch Intelligent Home

Better than advertised. The relay is actually SPDT with connections for common, normally on, and normally off. Some of the Windows drivers are dicey (as in won't work), but a little Googling will find a working driver. On Linux, the driver is a standard part of the kernel, so no additional driver is required. Nifty little gadget, all in all.

Works well, relay sound is pretty loud. Here is a python script I wrote for windows (sound work other systems also) to open/close relay (requires pyserial):#-------------------------------------import serialimport sysargs = sys.argvprint("USB Relay Switch Karlan Mitchell")print("usage: relayswitch.py COM# on/off")ser = serial.Serial(args[1],9600) # open serial portprint("Connected on: " + ser.name) # check which port was really usedif args[2] == "on":print("Turning on")ser.write(b"\xa0\x01\x01\xa2")elif args[2] == "off":print("Turning off")ser.write(b"\xa0\x01\x00\xa1")else:print("NO ACTION PERFORMED, SEND \"on\" or \"off\"")print("Exiting, bye!")ser.close()#-------------------------------------

It works, but the software took awhile to find for Linux, and it does NOT work with "usbrelay" package (different firmware). I bought the 2 relay package also, that is easier to get setup.

Just received it, so I cannot speak to long term durability, but it does what it says. Easy to control (using C# for my purposes), and functions as expected. Solder quality is very good (at least IPC class 2).

Great little serial-USB relay, Works with Linux Mint 21.3 and with Windows 10.

Put aside for the moment that this module consists of a PC board that has no facility for mounting it to anything; no screw holes, no mounting clip, etc. It functioned for a little over 30 days, then quit working. It still showed up as a ttyUSB device in Linux and a COM device in Windows, but you could send it commands until doomsday and the relay state would not change. The LEDs did not change state either.Contacting the vendor resulted in them insisting it was a "driver" problem, willfully ignoring that it had been working for a month with the same drivers, then suddenly quit.Anyway for a few bucks more you can get an equivalent product in a plastic mounting, no worries about shorting out that 120VAC you're switching.

Works well - has 1 LED for off and 2 LED for on. You can get it working in Windows with a CH340 driver. Linux automatically picks it up in /dev/ttyUSB0. With either c# scripting in windows (Windows picks it up for me as COM5) or a simple echo command in linux with the given hex code you can close or open the relay.

A0 01 01 A2 *closes* the normally-open circuit (by activating the relay), and A0 01 00 A1 *opens* the circuit. I think this might just be a language problem - like maybe the seller doesn't get that a closed circuit is an active one, while a closed *port* (for example) is an inactive one.I wish they'd used a protocol that limited itself to printable characters. As it is, you can control this easily enough from a Linux system by creating 'on' and 'off' binary files and copying them to the appropriate /dev/tty file, as long as you've used stty to set the baud rate correctly.