Prototype Expansion Board with I2C Module Access Passive Buzzer, USB External Power Entry, Clean Wiring Layout for Coding Builds Labs

Organized Pin Layout: Clearly labeled control, power, and ground rows keep module wiring easier to follow during coding lessons, desk builds, and repeatable project setup Built In Prompt: The onboard passive buzzer adds sound cues for coding practice, alert demos, and interactive learning activities without another buzzer module Configurable Module: Selector cap output and dedicated SDA SCL points display or module wiring when projects need orderly I2C based expansion Supports double power supply options: USB 5V input and DC6–12V power supply, catering to a variety of power supply scenarios in the classroom and outdoors Flexible Power Entry: USB input and external round power input give practical setup options for classroom tables, maker work areas, and electronics practice with tidier wiring