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Sainsmart 16-Channel 12V Relay Board


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#1 pdinnissen

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Posted 20 March 2013 - 12:30 AM

Hi Everyone,

 

I'm trying to use this relay board in my project and have accidentally gotten it to work, but would like to confirm that I'm not damaging my Netduino if I leave my current configuration alone.

 

I'm using the following relay board:

http://www.sainsmart...-ttl-logic.html

 

Posted Image

 

Basically here's the process I followed:

1. Wired the 3.3V output of the Netduino to the 5V of the relay board's input (I read that this should be enough voltage to trigger the relays)

2. Wired the GND to GND, and desired outputs to the desired relay board's inputs

3. Wrote up the code.

4. Plugged in the Netduino through USB and powered the relay board only to find the LED on the Netduino flashing weirdly (seemed like it was in some type of error state).

5. Unplugged the Netduino USB and reset and discovered that all of a sudden my code was working and the relays were switching

 

It appears I made a false assumption that the relay boards inputs were isolated from its power supply and that the relay board is somehow powering the Netduino.

 

So I'm just wondering if this is bad for the Netduino, meaning that I should wire together some opto-isolators (or a shift register [color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]74HC595? can anyone confirm that this would isolate the Netduino?) to properly isolate the Netduino.[/color]

 

[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]Thanks[/color]



#2 NooM

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Posted 20 March 2013 - 07:04 PM

it looks like they are opto isolated (the ic's with the 4 pins look like couplers)

 

- but iam sure the 12 means it wants 12 to turn the relays. read what stands on them, they switch up to 250v at some amps

 

the weird flashing is maybe cos the relays drew so much power to switch on that there was a spike wich made the duino crash/kinda crash






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