Hello! I am totally new to arduino and electronics, so excuse my dumb questions. I have tried to lookup what is unclear to me, but haven't found the answer. I have an arduino pro mini working at 5V which I want to connect to a HC-05-Bluetooth-Modul working at 3.3V. I googled and have learned I ne…

Voltage dividing from 5V to 3.3V using a zener diode and a resistor

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