Introduction: Building an Android App to Communicate With the RN-42 Bluetooth Module

In this Instructable we will look at how to build a simple Android App that can connect and talk to an Arduino over a wireless Bluetooth connection. We will use the popular RN-42 Bluetooth module to create the Bluetooth signal from the Arduino. To create the Android App we will use the MIT App Inventor II, which is an easy to use graphical programming interface. Enjoy!

  • Link to download the Android app to load into MIT App Inventor II:

  • Follow this link to my blog to access the Arduino code:


Mavs41jk (author)2016-05-07

Does the app still work with the RN-52. And do you have any advice for controlling music on a phone using an arduino and rn 52 as a bluetooth remote

ForceTronics (author)Mavs41jk2016-05-08

I am not familiar with the RN-52 so I don't know. The app should work with any BT device that uses UART / serial protocol like that RN-42.