- I2C and SPI via USI for broad compatibility with sensors and peripherals such as temperature sensors, accelerometers, EEPROMs, and flash memory. - PWM available on 3 pins, with software PWM to provide additional PWM channels as needed. - 4-pin header arrangement for compact, straightforward wiring and easy integration into small projects. - Power LED and test LEDs provide quick visual status indicators during setup, testing, and debugging. - Suitable for microcontroller environments that support USI interfaces; ideal for prototyping and small-scale applications. Use scenarios - Build a compact sensor hub by connecting I2C sensors (and SPI devices) to a single board, enabling data collection and processing. - Create a small LED driver or actuator controller using PWM outputs to control brightness or speed in a space-constrained project. - Use the onboard LEDs for quick diagnostics during development to verify power status and signal activity without additional tooling.