I am very bad at electrical things, as I don't understand much of electrical engineering.
I was tasked to design a software that will take some inputs, randomize them and give some outputs to some relays. I did the software and somebody else designed the circuit. The problem is that now that somebody else is on vacation and I need to explain how to make connection to the relay and I have no idea how.
First of all, I found terms of Normally Closed, Normally Open, Active Low and Active High and I have no idea what they mean. I read about them but I do not understand.
Secondly, this is the relay module: https://www.tme.eu/ro/details/oky3012/module-pentru-relee/okystar/
It doesn't say which is NO, COM, or NC.
Thirdly, I understand that I can use a multi-meter to check for resistances from only-God-knows-where to I-have-no-idea-which point.
The program that I did on an ESP32 sets the relays output pin to HIGH, which means that the relay is off or not activated (for me it's output. basically the pin that will control something):
pinMode(Relay1_1,OUTPUT); digitalWrite(Relay1_1, HIGH);
And when I want to activate the relay or switch it on (make it click) I send a LOW signal to it.
To what pins of the relay do I need to connect something to be able to control it?