Long range sx1268 wireless module DRF1268DS with Arduino UNO for home automation

Projects Discussion and Showcase Home Automation
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Oldtron:
In the original post I notice that the DRF1262DS is connected directly to a Arduino UNO.
The UNO digital pins are 5v. But in the DRF1262DS data sheet it states that:

Rx 3.3v
Tx 3.3v
Mo grd or 3.3v

Wonder which I should believe ?

Thanks for your update. The logic level of DRF1262DS is 3.3V so it will be better to connect it to 3.3V I/O pins. Anyway we add serial resistor on the I/O pins of the modules to restrict the current so these pins can be connected to 5V pins of UNO.