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I want to connect an SFM3520-OP fingerprint module with the RS232C serial port to the Raspberry Pi UART but I am doubtful about their logic level. Should I use a Max2323 or does it not need it?

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The Pi's UART is 3V3 (0-3V3) only. If you connect anything outside that range you will probably destroy the UART and the Pi.

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  • so what is the solution, friend? with which IC should I convert it to the RS232C(5 volt) level?
    – Mehdi dev
    Jun 15, 2019 at 6:36

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