I want to trigger events on the raspberry (3) with an Arduino. Because of very contrary statements to this, i am kinda Lost. Arduino outputs 5V, that should be read by an Input of the Raspberry. Just slow Low/High Values, kinda like Buttons presses.
Different Possibilities I found:
Voltage Divider from 5v to 3,3v for Raspberry Pi (for example: 10k and 18k, for ~3v on the Input): That would the way that I think it is the easiest. But I stumbled over a lot of statements that say they would not recommend that, because of burned GPIOs. And the pullups of the Raspberry GPIO should be a problem. Later I found that the raspberry has software set able pull up/down resistors. It feels like lots of people don't know that they can disable them?
Voltage Level Breakout boards: That would be the easy way to go, but costs money and I don't need a bidirectional connection.
Levelshifter ICs: self explanatory.
Circtuit with a Transitor: Self explanatory, that would be my choice if Voltage Divider don't work.
So perhaps you can explain me what fact is against using a Voltage divider to connect these two boards. I just want to understand the issue, if there is one. :)