The document presents the design overview, software design, hardware design, mechanical design, safety features, advantages, disadvantages, testing, and results of a project to interface a computer with a microcontroller using a CP2102 chip. The CP2102 converts RS-232 voltage levels to TTL voltage levels and interfaces with the computer's COM port using MATLAB to send and receive single digit data. The design aims to be easy to use, safe, expandable, capable of being built at home, and soon to be a manufactured product. Potential disadvantages include reduced efficiency in dim environments and possible itching or irritations.