---
product_id: 369174476
title: "SainSmart 16-Channel 9-36V USB Relay Module"
brand: "sainsmart"
price: "1116 DH"
currency: MAD
in_stock: true
reviews_count: 5
category: "Sainsmart"
url: https://www.desertcart.ma/products/369174476-sainsmart-16-channel-9-36v-usb-relay-module
store_origin: MA
region: Morocco
---

# Supports 9-36V DC power supply USB interface for seamless PC integration 16 SPDT relays for versatile control SainSmart 16-Channel 9-36V USB Relay Module

**Brand:** sainsmart
**Price:** 1116 DH
**Availability:** ✅ In Stock

## Summary

> ⚡ Command Your Smart Space with 16 Channels of Power!

## Quick Answers

- **What is this?** SainSmart 16-Channel 9-36V USB Relay Module by sainsmart
- **How much does it cost?** 1116 DH with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ma](https://www.desertcart.ma/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

- • **Wide Voltage Range:** Operates smoothly from 9V to 36V DC for flexible setups
- • **Power Your Automation:** Handles up to 10A/250V loads for robust device control
- • **Plug & Play USB Control:** Easily manage relays via USB with LED status indicators
- • **Reliable Opto-Isolation:** Protects your PC and devices from electrical noise and surges
- • **Expand Your Smart Projects:** Ideal for robotics, home automation, and custom electrical switching

## Overview

The SainSmart 16-Channel USB Relay Module is a professional-grade, opto-isolated relay board featuring 16 SPDT relays controllable via USB. It supports a wide DC power range (9-36V) and can handle loads up to 10A/250V, making it perfect for advanced home automation, robotics, and electrical switching projects. Each relay has an LED indicator for real-time status, ensuring reliable and intuitive control.

## 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 | #88,481 in Computers ( See Top 100 in Computers ) #785 in Motherboards |
| Manufacturer | SainSmart |
| Manufacturer reference | USB Relay Module |
| Package Dimensions | 29.21 x 12.29 x 3.71 cm; 240 g |

## 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)

## 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
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*Product available on Desertcart Morocco*
*Store origin: MA*
*Last updated: 2026-02-20*