I want to do serial communications between an Arduino and an Einsy Rambo (which is part of my Prusa i3 MK3 printer). I believe that the Einsy Rambo serial pins, TX and RX, operate at 5 volts, like the rest of the Rambo.
Is there a particular version of the Arduino that I should use so that its serial pins are compatible with the Rambo without any extra circuitry, like a level shifter?
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