NOYITO 1-Channel 5V Computer USB Control Switch Relay Module Drive-Free Relay Module Plug and Play Suitable for PC Smart Controller

Works as it should and the seller was very responsive to questions.

This appears to be remarketed from SainSmart. The SainSmart website claims it has an FTDI FT245L USB chip in it. As seen in the attached photo, it does not. Instead, it is an Atmel ATMega8. With the FTDI virtual com port (VCP) driver installed on my Windows 11 PC, this does not appear as a COM port. One new device appears as "HID-compliant vendor-defined device". But there is no documentation, not in English, not in Chinese, not from Noyito, not from SainSmart, not from anybody. And FTDI's documentation is obviously not relevant.I did find a website that listed Noyito as a registered trademark of Changzhou Xuchuang Information Technology Co., Ltd.. But they don't seem to have a website.So this appears to be $20 of landfill. It seems that Acroname makes a similar board for twice the price that comes with documents to make it usable.

Because they do not publish the detailed interface, you must use a Windows dll, and write your own C++ application. Not portable across platforms or other languages.If developing your own Windows application, or using their demonstration apps, on Windows, meets your needs, this is an affordable piece of hardware. I wrote my own C++ app, which I schedule from a Python application. That got around the language limitation. I used a timer, in the C++ app, to create a pulse, and specify which relay, and how long to stay on, as command line arguments.The product is working fine. I was surprised at the lack of a detailed interface definition, and the requirement to use their dll on Widows.

Here is some quick java code that worked. Dont judge the code quality as its just thrown together to work as an example. Requires NO external libraries.private static void relayOn(boolean on, int idx) throws Exception {ClassPathLibraryLoader.loadNativeHIDLibrary();HIDDeviceInfo[] hids = HIDManager.getInstance().listDevices();HIDDeviceInfo relayInfo=null;for ( HIDDeviceInfo dev : hids ) {//System.out.println(dev.toString());//System.out.println(dev.getProduct_string());if ( "USBRelay4".equals(dev.getProduct_string()) ) {relayInfo = dev;}}HIDDevice relay = HIDManager.getInstance().openByPath(relayInfo.getPath());//relay.getFeatureReport(new byte[] {0x0,0x0});byte[] send = new byte[9];send[0]=0x0; //Report IDif (idx<=0) {if ( on ) {send[1]=(byte) 0xfe;} else {send[1]=(byte) 0xfc;}} else {if ( on ) {send[1]=(byte) 0xff;send[2]=(byte) idx;} else {send[1]=(byte) 0xfd;send[2]=(byte) idx;}}relay.sendFeatureReport(send);relay.close();}

It's not working on my WIN10 at the beginning, because WIN10 recognized it as DigiUSB for some reason.After deleted wrong driver and let WIN10 install again it works like a charm.

The relays were arcing and getting stuck in closed position on a 3 amp 110 Vac load, which baseed on specifications of the seller, this device should be good up to 10 amps.The seller quickly sent a replacement (received within 3 days of notifying of the problem) and problem solved! Wish the original product worked, but I can say that if you have problems and need to contact the seller, their service is very quick.

Connected this product to HP Elitebook notebook running latest Windows 10 X64 operating system. Ran the recommended by seller software GuiApp_English.exe tool. It does not see connected USB relay board at all. Yet Windows device manager sees USB relay board as "USB Input Device" 0x16C0 0x05DF. Tried all USB ports on this notebook, same result.Useless purchase? The USB relay board has a microcontroller Tiny45 on it. My guess is that the firmware in microcontroller is defective or incompatible with Windows 10 X64. Doubt that microcontroller firmware can be updated remotely. Unless seller addresses the problem will return the product.Upgraded to 2 star after spending a lot of time troubleshooting this product issues.For those who are engineers - read on.1. This is HID class device, no serial port is involved. Some legacy software may be confused2. Apparently this product has USB issues when another USB device is connected to the same USB Hub. For example, when a USB camera is connected then either camera will work and USB relay won't, or the camera won't work and USB relay will work.

Bought relay it worked for a few days then the relay serial number stopped displaying and the device causes the control SW to crash.I have a 2 channel unit that seems to work fine and has been working for a month. Disappointed in this as I have it all tested and working as I wanted and went to deploy it and no go...