The flyback diode in parallel to the relay protects the GPIO from the discharged EMF when the relay deactivates.
Discussion
So the resistor and transistor stabilize input into the relay? I just read about this, I don't understand the risk of not having the flyback. The residual voltage would only be fractions of a volt right? No capacitors or anything to hold a charge so what is the danger?
So you're just trying to make an "On air" sign for your node essentially?
Very green, very eager to learn.
I'm pretty new to this too, so I wouldn't want to teach you any misunderstandings that I haven't gotten rid of yet. This is the article that finally made it click for me: https://www.circuitbasics.com/5v-relays-in-the-raspberry-pi/
I hear that. Thank you for the resources, fren.
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