A Star 32U4 Prime

These form-factor, USB-enabled microcontroller boards are used for rapid prototyping of robotics, sensing, automation, and embedded projects. They provide a compact control core with plentiful I/O, easy software support, and broad compatibility with shields, sensors, displays, and motor controllers.

Common variants include boards designed for SMT components only and boards offered in different voltage configurations, which affect how they integrate with various power rails and peripherals. Some models support microSD storage for logging data or running small applications from removable storage. Reliability comes from standard pinouts, straightforward integration with the ecosystem, and consistent software libraries. This family suits hands-on builds needing a compact, compatible control board.