I have a little setup in which I want to trigger certain events on the Arduino using Raspberry Pi's GPIOs. Therefor, I connected GPIO 21 to Arduino's digital Pin 5 and Pi's GND to Arduino's GND. Pin 5 is defined as input and triggers my code if it reads a HIGH. Since Arduino considers any voltage greater than 3V as HIGH, it works just fine if I set my Pi's GPIO to HIGH.
I wondered if this setup could possibly destroy my Pi (since its GPIOs can only handle 3,3V). Thanks.
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