In this video I use an Arduino with Bluetooth Low Energy BLE and a smart phone app created with MIT App Inventor to control the speed and direction of a gearmotor. The Arduino also reads the motor encoder and send the motor rpm to the Android application. The Arduino version is the Bluno Nano BLE, which is essentially a miniature Arduino Uno with built-in Bluetooth (BLE). In this tutorial, I will explain both the Arduino code and the smart phone application using MIT App Inventor 2.
I have posted the source code here: https://sciencefuninnovation.gumroad.com
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