Digital Keyboard with Sound Output using Arduino

This project presents the design and implementation of a digital keyboard with sound output using the Arduino platform. The system integrates multiple tactile push buttons, a voltage divider configuration for analog signal reading, and a piezo buzzer for sound generation. Each button produces a distinct analog voltage level that is interpreted by the Arduino microcontroller to identify the selected input and generate a corresponding audio frequency using the built-in tone function. The project demonstrates fundamental principles of analog signal acquisition, digital sound synthesis, and human–machine interaction in embedded systems. Developed as a practical laboratory activity, the system provides students with hands-on experience in microcontroller programming, circuit design, and real-time signal processing within an educational engineering environment.