ATOMIC is a DIY expansion kit specifically designed for the ATOM series controllers, making it convenient for users to design their own small circuits or connect external hardware. It can be directly stacked on the ATOM series controllers via the 9 pins on the base.. The kit includes two Proto blank boards, with each board providing over 60 holes to accommodate users' spatial layout needs. It also comes with a pair of 3.96*4P connectors, ensuring reliable external electrical connections.