Connecting an Arduino Mini Pro 3.3V/8MHz with an Arduino UNO 5V/16MHz

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hi, know if there problem using arduino clock frecuency of 8mhz, , sending/receiving data to/from arduino @ 16 mhz. want establish simple serial connection between them.

thanks answers.

the board profiles in arduino ide automatically manage clocks you, make sure change board setting.

you want voltage divider on 5v side's transmit (tx) bring down 3.3v, 3.3v tx side enough drive 5v side's receive (rx)


Arduino Forum > Using Arduino > Project Guidance > Connecting an Arduino Mini Pro 3.3V/8MHz with an Arduino UNO 5V/16MHz


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