HC-05 TX,RX divider rule I'm using the HC-05 Bluetooth module but I'm confused about the TX,RX pins.
I want to know when should I connect the RX to a divider circuit to convert 5v to 3.3v.
Because while searching, I saw both of the following:


either RX is connected to TX of the UNO and TX is connected to RX of the UNO without a divider circuit.
or RX is connected to a divider circuit and then connected to any digital pin , TX is connected to any digital pin as well.


So can you give me a thought about both the situations?
my thought is that only digital pins needs a divider rule, but the TX,RX pins can be connected directly and operates without any problems but if so, then what's the difference between both??
Note that I'm using HC-05 to turn on a LED.
Hope to see some good explanation that suits a new Arduino learner.
Thank you..
While you should use a voltage divider on the Arduino TX --> BT RX signal, you honestly don't need to. Many people, including myself, have used HC-05s without voltage dividers and haven't let "the magic smoke" out of the device. Adding a voltage divider may, though, may increase the lifespan of the HC-05.