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..