--- product_id: 369174476 title: "SainSmart 16-Channel 9-36V USB Relay Module" brand: "sainsmart" price: "328.67 DT" currency: TND in_stock: true reviews_count: 5 category: "Sainsmart" url: https://www.desertcart.tn/products/369174476-sainsmart-16-channel-9-36v-usb-relay-module store_origin: TN region: Tunisia --- # Supports 9-36V DC power supply 10A/250V max load per relay 16 SPDT relays for versatile control SainSmart 16-Channel 9-36V USB Relay Module **Brand:** sainsmart **Price:** 328.67 DT **Availability:** ✅ In Stock ## Summary > ⚙️ Elevate your smart projects with 16-channel power and precision control! ## Quick Answers - **What is this?** SainSmart 16-Channel 9-36V USB Relay Module by sainsmart - **How much does it cost?** 328.67 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/369174476-sainsmart-16-channel-9-36v-usb-relay-module) ## 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 - • **High Load Capacity:** Each relay handles up to 10A/250V, empowering you to switch heavy-duty appliances effortlessly. - • **Wide Voltage Range:** Flexible 9-36V DC input adapts to diverse power setups, ensuring compatibility and reliability. - • **Power Your Automation:** Seamlessly control up to 16 devices with robust SPDT relays, perfect for smart homes and robotics. - • **USB-Controlled Precision:** Plug-and-play USB interface with LED indicators for real-time status and easy integration. - • **Optimized for Reliability:** Opto-isolation and external power supply support minimize interference and maximize response speed. ## Overview The SainSmart 16-Channel USB Relay Module is a professional-grade, opto-isolated control board featuring 16 SPDT relays capable of switching loads up to 10A/250V. Designed for home automation, robotics, and industrial projects, it supports a wide 9-36V DC power range and offers USB connectivity with LED status indicators for intuitive operation and enhanced reliability. ## Description SPECIFICATION Maximum load: 10A/250V Power supply: DC 9V~36V LED for each relay output Power LED USB LED WHAT'S IN THE PACKAGE 1x 16-Channel USB Relay Module Review: Seems to work. Haven't connected anything to the relays or used the external power supply yet. Only got as far as writing a LabVIEW vi to control it. Review: As another has noted, do use the external power supply port and pull the jumper. It had issues just running off the usb power. I was also able to confirm the other report that sometimes if you go too fast a relay can miss a command, but I saw that more often on usb bus power. A good power supply makes it reliable and faster to respond. In my case I have hundreds of amps available. I wrote my own linux driver that waits for the reply to echo back before considering it applied. I can run this in fast process-level parallel and the reply messages can interleave. So I have a random-delay-then-retry logic to make sure it gets a correct acknowledgement. Seems to be reliable enough when I do that. See serial on then off, then parallel (don't wait for reply) on then off. That being said the rest of the world is at 115200 baud for usb serial. Why default to 9600? The ch340 family can go that fast if they changed one line of code. I also found that it's decently reliable if I close and reopen for write after every command while not waiting for a reply (about half as fast). Even though it's not perceptably any slower (at 9600 baud). That must mean the wait time before resending is clearly almost imperceptible. This means their microcontroller code is a little broken to not be handling these requests with pointer queues to a ring buffer, but they are actually doing work while they have listening turned off. I tried adding characters to pad space in time predictably. It didn't work. It's just oddly buggy when you go fast. Other then these notes, it appears to work decently enough. I'll be rewiring my van to use this to control all my 12v appliances. The LED indicator lights work well, ## Features - This is USB controlled relay opto-isolated board with 16 SPDT relays. - You can use it for simple ON/OFF switching electrical devices - home lights, DC motors, solenoids and others. - It can help you building projects like robotics and home automation. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0793MZH2B | | Best Sellers Rank | #93,647 in Computers ( See Top 100 in Computers ) #825 in Motherboards | | Brand Name | sainsmart | | Coil Voltage | 36 Volts | | Connector Type | Usb | | Contact Current Rating | 10 Amps | | Contact Material | Silver | | Contact Type | Normally Open | | Current Rating | 10 Amps | | Customer Reviews | 3.7 3.7 out of 5 stars (39) | | Manufacturer | SainSmart | | Maximum Switching Current | 10 Amps | | Maximum Switching Voltage | 36 Volts | | Minimum Switching Voltage | 9 Volts | | Mounting Type | PCB Mount | | Operating Time | 0.5 Seconds | | Operation Mode | Automatic | | Part Number | USB Relay Module | | Wattage | 90 watts | ## Product Details - **Connector type:** Usb - **Contact material:** Silver - **Contact type:** Normally Open - **Current rating:** 10 Amps - **Mounting type:** PCB Mount ## Images ![SainSmart 16-Channel 9-36V USB Relay Module - Image 1](https://m.media-amazon.com/images/I/71wb3DN51VL.jpg) ![SainSmart 16-Channel 9-36V USB Relay Module - Image 2](https://m.media-amazon.com/images/I/81uNE4knpJL.jpg) ![SainSmart 16-Channel 9-36V USB Relay Module - Image 3](https://m.media-amazon.com/images/I/61Gnty8ZToL.jpg) ![SainSmart 16-Channel 9-36V USB Relay Module - Image 4](https://m.media-amazon.com/images/I/81ZnxuY7ibL.jpg) ![SainSmart 16-Channel 9-36V USB Relay Module - Image 5](https://m.media-amazon.com/images/I/81HbZf+GuvL.jpg) ## Questions & Answers **Q: Where can I download the software for this board ?** A: Hi, you can download from this link: http://s3.amazonaws.com/s3.image.smart/download/101-70-208/101-70-208.zip **Q: is the ground pin of each channel connected together or each channel is totally isolated?** A: Hi, the ground of the control terminals is connected together, and each channel at the input is completely isolated. **Q: Why do the commands not work when input into a serial terminal connected to the com port assigned? using putty 9600bps 8n1 i have added \r\n** A: Not sure what you entered there and if you have a proper serial port through the USB interface. Note there are many bytes to fransfer including a checksum if I remember correctly. (Did create some Python code which uses python usb) **Q: Is it possible to expand this module to control more than 16 channels? If no, any other alternatives plz?** A: You can use a RPI with for example 4 modules, but It's better using 8-Channel USB because it contains serial number, so you have the possibility to identifiy witch module you use. It isn't possible with 2 module 16 channels on a RPI. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by T***C on 2 August 2021* Seems to work. Haven't connected anything to the relays or used the external power supply yet. Only got as far as writing a LabVIEW vi to control it. ### ⭐⭐⭐⭐ Review *by S***Y on 11 August 2025* As another has noted, do use the external power supply port and pull the jumper. It had issues just running off the usb power. I was also able to confirm the other report that sometimes if you go too fast a relay can miss a command, but I saw that more often on usb bus power. A good power supply makes it reliable and faster to respond. In my case I have hundreds of amps available. I wrote my own linux driver that waits for the reply to echo back before considering it applied. I can run this in fast process-level parallel and the reply messages can interleave. So I have a random-delay-then-retry logic to make sure it gets a correct acknowledgement. Seems to be reliable enough when I do that. See serial on then off, then parallel (don't wait for reply) on then off. That being said the rest of the world is at 115200 baud for usb serial. Why default to 9600? The ch340 family can go that fast if they changed one line of code. I also found that it's decently reliable if I close and reopen for write after every command while not waiting for a reply (about half as fast). Even though it's not perceptably any slower (at 9600 baud). That must mean the wait time before resending is clearly almost imperceptible. This means their microcontroller code is a little broken to not be handling these requests with pointer queues to a ring buffer, but they are actually doing work while they have listening turned off. I tried adding characters to pad space in time predictably. It didn't work. It's just oddly buggy when you go fast. Other then these notes, it appears to work decently enough. I'll be rewiring my van to use this to control all my 12v appliances. The LED indicator lights work well, ### ⭐⭐⭐⭐⭐ Review *by G***G on 2 May 2025* Funcional y robusta ## Frequently Bought Together - SainSmart 16-Channel 9-36V USB Relay Module - SainSmart USB Eight Channel Relay Board for Automation - 12 V - SainSmart USB 4 Channel DC 12V Relay Module Automation for Arduino Raspberry Pi DSP AVR PIC ARM --- ## 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.tn/products/369174476-sainsmart-16-channel-9-36v-usb-relay-module](https://www.desertcart.tn/products/369174476-sainsmart-16-channel-9-36v-usb-relay-module) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-04-23*