Bluetooth and Android Studio

Hi guys! I´m new in the forums, but I know it´s a great resource and I will use it. I have a school project (last year of Argentina middle school) and I´m having trouble with creating an Android Studio app capable of communicate with a simple arduino (Nano, Uno, etc). I have investigated a lot of projects, but all of them have one little thing that makes the rest of both codes not work. I know this is not an Android Studio forum, but, I want to know if anyone of you have or know a simple and updated project with a simple bluetooth communication between a smartphone and an arduino. The rest of the project isn´t difficult and I have already made it (sensing temp and sensing RPM of a karting), but I´m stuck here.

Many thanks! :slight_smile: