--- product_id: 265639476 title: "SainSmart USB Eight Channel Relay Board for Automation - 12 V" brand: "sainsmart" price: "₨902" currency: SCR in_stock: true reviews_count: 5 category: "Sainsmart" url: https://www.desertcart.sc/products/265639476-sainsmart-usb-eight-channel-relay-board-for-automation-12-v store_origin: SC region: Seychelles --- # Supports up to 10A current per channel USB-controlled for seamless PC integration 8 SPDT relays for versatile switching SainSmart USB Eight Channel Relay Board for Automation - 12 V **Brand:** sainsmart **Price:** ₨902 **Availability:** ✅ In Stock ## Summary > ⚡ Empower your automation game with 8 channels of seamless control! ## Quick Answers - **What is this?** SainSmart USB Eight Channel Relay Board for Automation - 12 V by sainsmart - **How much does it cost?** ₨902 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/265639476-sainsmart-usb-eight-channel-relay-board-for-automation-12-v) ## Best For - sainsmart enthusiasts ## Why This Product - Trusted sainsmart brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug & Automate:** USB interface ensures effortless connection and control via your PC—perfect for smart home or robotics projects. - • **High-Current Ready:** Doubled high current PCB tracks and copper contacts guarantee reliable switching under heavy loads. - • **Isolation & Safety:** Extra PCB openings enhance voltage isolation, minimizing interference and boosting durability. - • **8-Channel Powerhouse:** Control multiple devices simultaneously with 8 robust SPDT relays rated for 10A each. - • **Universal Software Support:** Compatible with multiple programming environments and comes with dedicated software for instant setup. ## Overview The SainSmart USB Eight Channel Relay Board is a 12V-powered, USB-controlled module featuring 8 SPDT relays rated for 10A each. Designed for home automation, robotics, and electrical switching projects, it offers enhanced voltage isolation, doubled high-current PCB tracks, and broad software compatibility for Windows environments. Ideal for professionals seeking reliable, scalable control solutions with easy PC integration. ## Description This is a USB controlled relay module with 8 relays SRD-12VDC-SL-C. You may use it for simple ON/OFF switching electrical devices - home lights, DC motors, solenoids, and others. It may help you building projects like robotics and home automation. Each such board requires one USB port. The more USB ports you have the more Relay boards you may connect. You may use it with our software( universal software for all our relay boards).Specification* Relay specification: 10A 250VAC/10A 125VAC/10A 30VDC /10A 28VDC * Power Supply: 12 VDC * Current consumption: 300 mA * Led for each relay output: Power Led / USB led * Size: 93mm / 70mm / 16mm * Windows software examples: VB6, BCB6, Java (netbeans), VB.NET 2010 Express, C++.NET 2010 Express * PCB parameters: FR4 / 1.5mm / two layers / metalized holes / HAL / white stamp / solder maskNote* When the board is connected to the PC while PC is restarted, the relays will be toggled several times which because of the structure of the FTDI chip. * The device must be supplied with 12 VDC or order to work. * There is no protection against reversed voltage! If the VCC(+12V) and GND are reversed the board will be damaged! * The board can not work without computers. * If you need our software, please contact our customer service via email.Instructionshttp://s3.desertcartaws.com/s3.image.smart/download/101-70-116/USB_8CH_12V.zip Review: works - I purchased this to switch contacts in a data acquisition setup. It works well, all relays function correctly. The 'Relay Manager' program that you can download from the link (and their website) works perfectly. I am having only one issue. I am using LabVIEW to control the board and I cannot get the given (from the download link) library files to open the board. That is, I can run the Open file and get an OK error status in return (it will return various error statuses, depending on the result) but the board will not actually open. I can get the device description, location and handle, but no communication connection. I tried a USB sniffer to check the data going over the port but couldn't seem to find what I was looking for. I contacted the company and was given all the information that I already had. They were very prompt and courteous, but no real help. I never spoke with a programmer, only a secretary or some such. The problem may be with LabVIEW but seems to be some command that I don't know since I can send other commands correctly. I am running Windows 7 and that may be an issue since the library files were written several years ago, although they have stated that they are compatible with this version of Windows and I am not having any other problems. Anyway, my solution (until I can figure out what to do) is to open the board with the 'Relay Manager' and then send commands to the board as I like using my LabVIEW program. I only have to open the board once until I restart my computer and can close the Relay Manager (the initial handshake, whatever it is, remains) and open and close LabVIEW as often as I like with no problems. Now, I had to experiment to find the commands to turn the relays on and off because I could not get their supplied commands to work. I tried and tried and might try some more later but I found what I need through trial and error so it's not an urgent issue right now. As an example, the company said to use FF 01 01 to turn on channel 1. I couldn't get that to work and use 11 instead. So, since the problem seems to be with my programming (although the given D2XX commands don't list anything to cover how to get an initial handshake and I have installed all of the necessary .net files and various drivers) I know that the board works (since their program works well) and I have found the commands to do what I want... I will give it five stars. The board is capable of allowing interface with external switches and will be very useful once I figure out how to get full control over it. edit: For those that are interested, I found the commands for this board (chip). I got a little time and decided to make a program like the one that is provided by the company. I was (once again) trying in vain to get their commands to work and finally just decided to try everything. Well, it turns out that it's pretty simple. After various combinations I found that the on/off state of the switches (relays) are simply represented by binary code from 0 to 255. That is, 00000001 (1 decimal, 01 hex) gives relay #1 on (rest off); 11111111 (255 decimal, FF hex) gives all relays on; 00101101 (45 decimal, 2D hex) gives relays 1, 3, 4, 6 on and the rest off; etc. Also, the communication problem was likewise easily fixed with a little attention to detail. Have fun. Review: Perfect for virtual pinball cabinet! - Purchased for use with a virtual pinball cabinet. This is the 8 relay usb board that is recognized by the DOF software. The board comes with no manual, so you will need to go to Sainsmart’s website to get the driver and manual (the driver is in the same zip file as the manual). Everything worked perfect upon the driver install in windows10, and now i have 8 channels to plug in force feedback devices. Don’t forget to wire in diodes to any solenoids or contactors you hook up to this board or you will get flyback voltage which will cause usb disconnects. ## Features - 8 SPDT relays SRD-12VDC-SL-C - Supported by our software - Extra PCB openings for better voltage isolation - Doubled high current tracks ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0093Y89DE | | Brand | sainsmart | | Brand Name | sainsmart | | Coil Voltage | 12 Volts | | Connector Type | Solder | | Connector type | Solder | | Contact Current Rating | 10 Amps | | Contact Material | Copper | | Contact Type | spdt | | Contact material | Copper | | Contact type | spdt | | Current Rating | 10 Amps | | Current rating | 10 Amps | | Customer Reviews | 4.1 out of 5 stars 112 Reviews | | Manufacturer | SainSmart | | Maximum Switching Current | 10 Amps | | Maximum Switching Voltage | 12 Volts | | Minimum Switching Voltage | 11 Volts | | Model | 8541582310 | | Mounting Type | PCB Mount | | Mounting type | PCB Mount | | Operation Mode | Automatic | | Part Number | 11601 | | Unit Count | 8.0 Count | | Wattage | 120 watts | ## Product Details - **Connector type:** Solder - **Contact material:** Copper - **Contact type:** spdt - **Current rating:** 10 Amps - **Mounting type:** PCB Mount ## Images ![SainSmart USB Eight Channel Relay Board for Automation - 12 V - Image 1](https://m.media-amazon.com/images/I/6162rh6ZAGL.jpg) ![SainSmart USB Eight Channel Relay Board for Automation - 12 V - Image 2](https://m.media-amazon.com/images/I/51bTjbzGQBL.jpg) ![SainSmart USB Eight Channel Relay Board for Automation - 12 V - Image 3](https://m.media-amazon.com/images/I/517IdSxrE0L.jpg) ![SainSmart USB Eight Channel Relay Board for Automation - 12 V - Image 4](https://m.media-amazon.com/images/I/51kca8xlFbL.jpg) ![SainSmart USB Eight Channel Relay Board for Automation - 12 V - Image 5](https://m.media-amazon.com/images/I/41zSHDCt-bL.jpg) ## Questions & Answers **Q: The unit is functioning as expected. However, after it's use more, the unit cause computer to crash, when turning the on/Off a few time, the program hang up on the write command. The computer needed to reboot to recover. Any idea about this issue ? There are posts on the web that shows the similar issues. Do you have …** A: i know this question is old, but other people might be having the same problem. I had the same problem after so much iteration of write. what i did was clear the cache. the memory can only hold so much write before it hangs. I clear the cache before every write. it worked for me **Q: Do they provide a tool to control the board through command line?** A: You can download a sample tool from them which controls it via gui. I never saw a command line tool. It wasnt hard to integrate their commands into my own platform so a basic coder could probably make you a command line tool. **Q: Can this be used to give nc / no contacts?** A: I'm not sure of your question. This card has eight relays. Each relay has three screw clamp terminals where one is normally open, one is normally closed and the last is the common. So you can wire your device(s) to any or all relays in either normally open or closed position as you like. I hope this clarifies things. **Q: I want use as programmable sequential controller for my business led street sign, this unit need computer for program only or need computer to run.** A: You would need it connected to a computer. This unit does not have any sort of programmable timers or states. It is more or less a light switch you control via a computer button. ## Customer Reviews ### ⭐⭐⭐⭐⭐ works *by G***S on 26 July 2013* I purchased this to switch contacts in a data acquisition setup. It works well, all relays function correctly. The 'Relay Manager' program that you can download from the link (and their website) works perfectly. I am having only one issue. I am using LabVIEW to control the board and I cannot get the given (from the download link) library files to open the board. That is, I can run the Open file and get an OK error status in return (it will return various error statuses, depending on the result) but the board will not actually open. I can get the device description, location and handle, but no communication connection. I tried a USB sniffer to check the data going over the port but couldn't seem to find what I was looking for. I contacted the company and was given all the information that I already had. They were very prompt and courteous, but no real help. I never spoke with a programmer, only a secretary or some such. The problem may be with LabVIEW but seems to be some command that I don't know since I can send other commands correctly. I am running Windows 7 and that may be an issue since the library files were written several years ago, although they have stated that they are compatible with this version of Windows and I am not having any other problems. Anyway, my solution (until I can figure out what to do) is to open the board with the 'Relay Manager' and then send commands to the board as I like using my LabVIEW program. I only have to open the board once until I restart my computer and can close the Relay Manager (the initial handshake, whatever it is, remains) and open and close LabVIEW as often as I like with no problems. Now, I had to experiment to find the commands to turn the relays on and off because I could not get their supplied commands to work. I tried and tried and might try some more later but I found what I need through trial and error so it's not an urgent issue right now. As an example, the company said to use FF 01 01 to turn on channel 1. I couldn't get that to work and use 11 instead. So, since the problem seems to be with my programming (although the given D2XX commands don't list anything to cover how to get an initial handshake and I have installed all of the necessary .net files and various drivers) I know that the board works (since their program works well) and I have found the commands to do what I want... I will give it five stars. The board is capable of allowing interface with external switches and will be very useful once I figure out how to get full control over it. edit: For those that are interested, I found the commands for this board (chip). I got a little time and decided to make a program like the one that is provided by the company. I was (once again) trying in vain to get their commands to work and finally just decided to try everything. Well, it turns out that it's pretty simple. After various combinations I found that the on/off state of the switches (relays) are simply represented by binary code from 0 to 255. That is, 00000001 (1 decimal, 01 hex) gives relay #1 on (rest off); 11111111 (255 decimal, FF hex) gives all relays on; 00101101 (45 decimal, 2D hex) gives relays 1, 3, 4, 6 on and the rest off; etc. Also, the communication problem was likewise easily fixed with a little attention to detail. Have fun. ### ⭐⭐⭐⭐⭐ Perfect for virtual pinball cabinet! *by V***E on 20 September 2020* Purchased for use with a virtual pinball cabinet. This is the 8 relay usb board that is recognized by the DOF software. The board comes with no manual, so you will need to go to Sainsmart’s website to get the driver and manual (the driver is in the same zip file as the manual). Everything worked perfect upon the driver install in windows10, and now i have 8 channels to plug in force feedback devices. Don’t forget to wire in diodes to any solenoids or contactors you hook up to this board or you will get flyback voltage which will cause usb disconnects. ### ⭐⭐⭐⭐⭐ Great board for automation *by S***N on 15 August 2013* This board works great. I was able to use LabView to configure the board to do bit bang mode. From there, you just write a byte of data to it. Each bit in that byte of data represent a relay. 1 turn it on and 0 to turn it off. All the FTDI functions VIs are supplied by the FTDI chip Vendor, and two examples are given. Overall, the board is nicely built, very rugged. It works as advertised. ## Frequently Bought Together - SainSmart USB Eight Channel Relay Board for Automation - 12 V - MILAPEAK 8pcs (4 Sets) 8 Positions Dual Row 600V 25A Screw Terminal Strip Blocks with Cover + 400V 25A 8 Positions Pre-Insulated Terminals Barrier Strip (Black & Red) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sc/products/265639476-sainsmart-usb-eight-channel-relay-board-for-automation-12-v](https://www.desertcart.sc/products/265639476-sainsmart-usb-eight-channel-relay-board-for-automation-12-v) --- *Product available on Desertcart Seychelles* *Store origin: SC* *Last updated: 2026-09-11*