I wanted to order a HC-05 bluetooth module, but I´m just not sure about if its what i need. I want to create some kind of arduboy, but instead of using an LCD screen, I planned to use my samsung Galaxy S4. May I use the HC-05 Master mode to connect and send digital signals to my cellphone? If not, what may I use to connect wirelessly my arduino to my cellphone.
You'll need to learn how to program for the Android. Up for that challenge?