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voltage level of Rx and Tx?

My new nextion 2,8 touch should be connected with a 3,3V Arduino.

The nextion wants to be powered wit 5V.

But what level do the Rx and Tx pins have/need?

Do I need a 5V level, or can I connect them directly to the pins of a 3,3V arduino

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nope, they are 3.3 volt - I am using one with a ESP8266.

One thing to note - If you power the display and the arduino sepratly is to have a common ground


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