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 …

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

Do they provide a tool to control the board through command line?

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.

Can this be used to give nc / no contacts?

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.

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.

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.

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SainSmart USB Eight Channel Relay Board for Automation - 12 V

SainSmart USB Eight Channel Relay Board for Automation - 12 V

Product ID: 265639476

Details

Connector type
Solder
Contact material
Copper
Contact type
spdt
Current rating
10 Amps
Mounting type
PCB Mount

⚡Supports up to 10A current per channel

💻USB-controlled for seamless PC integration

🔌8 SPDT relays for versatile switching

€ 56.89

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Empower your automation game with 8 channels of seamless control!

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.

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.

Specifications

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

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