It works fine, documentation is not great,
This review is from: SainSmart USB 4-channel relay module board for Arduino UNO MEGA R3 Mega2560 Duemilanove Nano Robot (Electronics)
The board appears to be well made and seems to work well. It arrived promptly and well packaged.
The software support was fairly terrible though. You can download a rar file from the SainSmart website which has a closed source app which can control the board and a few data sheets, but no instructions on how to talk to the board from your own programs or from the command line. It took me a long time to figure out how to use it. See [...]
The relays on my board are connected only to the common and "normally closed" pins. Although the relays appear to be SPDT kind, and each relay has 3 connections, on my board the "normally open" pin does not appear to work at all. Of course, this can be worked around in software, so it's not a big deal.
It's a bit disappointing that the board needs a separate 5V power supply. Why can't it draw its power from the USB cable?
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Showing 1-2 of 2 posts in this discussion
Initial post: 2 Oct 2013 06:42:12 BDT
P. Grant says:
I'm a bit confused by the description, this looks like it's driven from a pc via usb and contains an arduino processor not "for arduino......" which is it?
In reply to an earlier post on 2 Oct 2013 11:46:26 BDT
R. Bradley says:
I'm driving mine from a PC via USB. I'm not sure what the suppliers meant in their description by "for Arduino UNO MEGA R3 Mega2560 Duemilanove Nano Robot".
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