The black square switch is an electrical switch commonly used in electronic DIY projects and as an accessory for open-source MCUs (Microcontroller Units). It features a self-locking mechanism with two legs, providing a secure and stable switch function. This switch is often used in DIY electronic projects and prototyping, allowing users to control various functions and operations. Its compact size and versatile design make it suitable for integration into small electronic devices and circuits. The black square switch is compatible with various microcontrollers and can be easily incorporated into electronic systems. It is commonly used to control power supply, signal routing, or as a user interface element for switching between different modes or functions. This switch is highly reliable and has a long lifespan, ensuring consistent performance and durability. It is designed to withstand repeated use and can handle moderate electrical loads. As an essential electronic DIY material, the black square switch provides hobbyists, makers, and electronics enthusiasts with a reliable and cost-effective solution for integrating switches into their projects. Its compatibility, self-locking mechanism, and open-source MCU support make it a popular choice for electronic prototyping and experimentation.