bit Expansion Board Each pin provides VCC and GND, enabling flexible switching between 3.3V and 5V. Three independently selectable 3.3V/5V pins offer versatile wiring options for complex projects. Designed for students, educators, makers, and programming enthusiasts to enhance handson skills and coding abilities. Ideal for classroom teaching, maker spaces, and labs. This expansion board supports innovative projects, including home systems. Compatible with I2C communication and includes an onboard passive buzzer. It enables connections to LCD displays and other I2C peripherals, making it an essential tool in your electronics toolkit. Use scenarios Classroom and lab demonstrations: teach basic electronics and I2C concepts by wiring sensors, displays, and buzzer feedback with flexible voltage choices. Home systems prototyping: develop small automation projects that require I2C peripherals and quick voltage switching for safe testing. Maker space experimentation: rapidly prototype with multiple 3.3V/5V options, connect LCDs and other I2C devices, and explore interactive projects without swapping boards.