Control Light Animations Using Android App

This interactive LED lighting project uses an Android smartphone to wirelessly command an Arduino Uno via Bluetooth. At the center of the system is the Arduino Uno, a microcontroller board that executes a programmed loop to control multiple super LEDs arranged for chasing patterns. Communication relies on the HC-05 Bluetooth module, which pairs with a custom Android application installed on a smartphone. When you tap a button on the smartphone screen—created using MIT App Inventor and compiled as an APK—the app sends specific serial characters through the wireless Bluetooth link. The HC-05 module receives these wireless signals and passes them to the Arduino Uno's hardware serial receive pins. Inside the Arduino, software running on the microcontroller interprets these incoming serial characters. Depending on the command received, the Arduino alters its internal timing and digital output states. This allows the user to dynamically switch between six distinct LED chasing patterns and adjust the blinking speed in real-time, all without needing to physically touch or reprogram the hardware setup on the breadboard.