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I'm planning a project with an RFID reader that connects to the GPIO pins on a RPi2 and will use the 3.3v pin. Additionally I wanted to add an active buzzer, which also would require an 3.3v pin.

Is it possible to share the 3.3v pin or do I have to add resistors in order to use the 5v pin somehow?

Active Buzzer: https://arduinomodules.info/ky-012-active-buzzer-module/

RFID Reader: https://www.amazon.com/SunFounder-Mifare-Reader-Arduino-Raspberry/dp/B07KGBJ9VG

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You can connect as many wires as you want to a 3V3 pin (pins 1 and 17).

Similarly you can connect as many wires as you want to a 5V pin (pins 2 and 4).

Similarly you can connect as many wires as you want to a ground pin.

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    Would it be appropriate to address the fact that the 3V3 pin will source only a limited amount of current?
    – Seamus
    Commented Mar 5, 2020 at 21:36

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