@Michal-Rok Thanks. I was thinking that an array of transistors to ground each relay pin might be the simplest way for me to ensure I don't overload the pins and this would fit the bill nicely.
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RE: Advice for using generic 5V relays
@Chris-Stratton Can you please elaborate on your comment about powering the relay externally? Do you simply mean that the power that is being triggered by the relays should be separately powered (it will be in my case, it's coming from an AC power supply) or that the 5V into the relay board should not come directly from the omega?
Advice for using generic 5V relays
I would like to hook my Omega 2+ to a relay module (not the official relay expansion). I've tested that I can hook the board up to the 5V pin on my omega dock and ground the relay pins to make them trigger, but using the 3.3V pin is not sufficient to trigger the relay. I'm presuming though that connecting the relay pins directly to the omega's GPIO pins would be a bad idea, because I'd assume when I take them to ground to trigger the relay it would send 5V to the pin and potentially damage the board. What steps should I take to protect the pins from over voltage? I could use a 3.3V <-> 5V logic converter, but this seems like overkill for the project. Maybe instead I should use an NPN transistor that connects the relay pin to ground when triggered by the omega? I could also probably insert a couple of resistors to form a voltage divider. Or am I just being overly cautious? Thanks for the advice.