For the RX input of my HC07 serial bluetooth module, I actually use a 5v to 3.3v voltage divider Where R1 is 1.8K and R2 3.6K
But I'm not sure it is what I should use. Some times it receives corrupted transmissions (but I have error detection code) and I'm wondering if it isn't because of those 2 resistors, but I haven't tried anything else...
There are more complicated solutions, which requires more components, I guess it's better than 2 resistors. But also sometimes I see "they" just use a 10K (or so) resistor between the 5V output and the 3.3V input.
Can someone tell me what is the simplest "acceptable" way to just convert a 5V logic to a 3.3v logic. Is the single 10K resistor solution enough?