Hi everyone and thanks in advance!
I'm having trouble understanding the connection of a external power supply to this specific relay shield:
This is a really useful module, but I'm not able to find a lot of documentation about it, I mean, I've readed a lot of posts related to relay shields and Arduino connection, but they are for different modules, for example this one:
There is a different way of connecting this one, and I'm not understanding it very well...
For example, you can check this link and the documentation is awesome! but my relay shield doesn't have this kind of connections, instead, I've found this documentation (it works the same way besides it is for a 8 channel module) but I'm not understanding how I can use opto-isolation...
The connections that I've made can be seen in the "wiring" attachment (sorry guys, really, I hope your eyes will still able to work after seeing that monstrosity :o).
The GND and VCC are connected to an external power supply (5V-1A DC). The IN's from 1 to 4 are conected to arduino pins 2 to 5, and I've removed the jumper between COM and GND, and connected arduino GND to COM...
The question is: can we say the relay module is, then, full isolated?
Thanks a lot, and sorry if it is a stupid question.