I have a bluetooth HC05 module on a breakoutboard w/pins for STATE/RX/TX/GND/+5V/EN.
Some tutorials say I need to use a voltage divider with 2 resistors, like these tutorials - http://www.martyncurrey.com/arduino-with-hc-05-bluetooth-module-in-slave-mode/
Others say I don't - https://alselectro.wordpress.com/2014/10/21/bluetooth-hc05-how-to-pair-two-modules/
(I only posted 2 tutorials but there's many others..)
I am using it without a voltage divider, and it appears to be working fine. Do I need to use a voltage divider? Why do some say to use it, and others not? Thanks!
edit - hc05 baud rate is 9600, it's being used to transmit very little data.