Where can I download the software for this board ?

Hi, you can download from this link: http://s3.amazonaws.com/s3.image.smart/download/101-70-208/101-70-208.zip

is the ground pin of each channel connected together or each channel is totally isolated?

Hi, the ground of the control terminals is connected together, and each channel at the input is completely isolated.

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

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)

Is it possible to expand this module to control more than 16 channels? If no, any other alternatives plz?

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.

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SainSmart 16-Channel 9-36V USB Relay Module

SainSmart 16-Channel 9-36V USB Relay Module

Product ID: 71083111

Details

Connector Type
Usb
Contact Material
Silver
Contact Type
Normally Open
Current Rating
10 A
Mounting Type
PCB Mount

⚡Supports 9-36V DC power supply

💡10A/250V max load per relay

🔌16 SPDT relays for versatile control

€ 99.18

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Description

🚀 Power Your Projects with 16 Channels of Precision Control!

PLUG AND PLAY USB CONTROL - Seamlessly integrate with your PC or embedded system via USB for fast, programmable switching—automation made effortless.
RELIABLE HIGH LOAD SWITCHING - Each relay handles up to 10A at 250V AC, ideal for lighting, motors, and solenoids without compromise.
EXPAND YOUR AUTOMATION ARSENAL - Control up to 16 devices simultaneously with robust SPDT relays—perfect for smart homes and robotics.
VISUAL FEEDBACK FOR INSTANT STATUS - Integrated LED indicators for each relay and power status keep you informed at a glance—no guesswork needed.
POWER FLEXIBILITY THAT FITS YOUR SETUP - Wide 9-36V DC input range ensures compatibility with diverse power sources, from automotive to industrial.

The SainSmart 16-Channel USB Relay Module is a versatile, 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 broad 9-36V DC power supply and offers USB connectivity for easy integration. With built-in LED indicators and reliable switching performance, it empowers professionals to automate multiple electrical devices efficiently and confidently.

Specifications

ASIN	B0793MZH2B
Best Sellers Rank	#632,339 in Automotive ( See Top 100 in Automotive ) #224 in Automotive Replacement Relay Control Module Relays
Brand Name	SainSmart
Coil Voltage	36 volts
Connector Type	Usb
Contact Current Rating	10 A
Contact Material	Silver
Contact Type	Normally Open
Current Rating	10 A
Customer Reviews	3.6 3.6 out of 5 stars (42)
Manufacturer	SainSmart
Maximum Switching Current	10 A
Maximum Switching Voltage	36 volts
Minimum Switching Voltage	9 volts
Mounting Type	PCB Mount
Number of Items	1
Operating Time	0.5 seconds
Operation Mode	Electrical
Part Number	USB Relay Module
Wattage	90 watts

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€ 99.18

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cyprus.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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1 month ago

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