https://howtomechatronics.com/tutorials/arduino/how-to-build-custom-android-app-for-your-arduino-project-using-mit-app-inventor/ ► Find more details, circuit schematics and source codes on my official website.
In this Arduino Tutorial we will learn how to build custom Android applications for controlling Arduino using the MIT App Inventor online application.
For this tutorial we have two example. The first example is controlling a simple LED and the second one is controlling a Stepper Motor using the smartphone. In my previous tutorial we already learned how to make the Bluetooth communication between the Arduino Board (visit Tutorial) and the Smartphone using the HC-05 Bluetooth module and explained the Arduino code needed for the first example.
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Music: Aduro by Jens Kiilstofte (machinimasound.com/music)