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

Product ID: 71083111

Details

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

⚡Supports 9-36V DC power supply

💻USB interface for seamless PC integration

🔌16 SPDT relays for versatile control

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Description

⚡ Command your devices like a pro — 16 channels of power at your fingertips!

VISUAL FEEDBACK - Individual LED indicators for each relay ensure instant status monitoring
WIDE VOLTAGE RANGE - Operates reliably from 9V to 36V DC to fit diverse setups
POWER YOUR AUTOMATION - Handles up to 10A/250V for robust device switching
EXPAND YOUR SMART HOME - Perfect for robotics, home automation, and custom electrical control
PLUG PLAY USB CONTROL - Easily integrate with PCs and Raspberry Pi for smart projects

The SainSmart 16-Channel 9-36V USB Relay Module is a versatile, opto-isolated relay board featuring 16 SPDT relays capable of switching up to 10A at 250V. Designed for seamless USB control, it supports a wide DC voltage range (9-36V) and includes LED indicators for each relay output, making it ideal for home automation, robotics, and custom electrical projects.

Specifications

ASIN	B0793MZH2B
Best Sellers Rank	#227,012 in Automotive ( See Top 100 in Automotive ) #78 in Automotive Replacement Relay Control Module Relays
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	3.6 3.6 out of 5 stars (42)
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	Electrical
Part Number	USB Relay Module
Wattage	90 watts

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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 Israel.

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