Power and power options - Power supply via USB or external supply 5V or 7-16V; On-board 5V regulator capable of about 500 mA. Power LED and a Test/Status LED on Pin0. Compatibility and standards - Supports IDE 1.0+ (OSX/Win/Linux) for easy development and broad tool compatibility. Interfaces and I/O - I2C and SPI (via USI) for efficient sensor and peripheral communication. - PWM available on 3 pins, with additional PWM possible using Software PWM. - ADC available on 4 pins for analogue sensing. Memory and performance - 8 kB Flash Memory (about 6 kB available after bootloader); I2C and SPI interfaces via USI. Use scenarios - Rapid sensor prototyping: connect I2C temperature, humidity, or accelerometer sensors, read data, and log to a host via USB or external power. - USB-powered projects: develop small USB peripherals or stand-alone tasks with a visible status indicator on Pin0. - PWM driven peripherals: dim LEDs or control small actuators using hardware PWM on 3 pins or extend with Software PWM as needed. This board combines flexible power options, broad OS compatibility, multiple serial interfaces, and practical I/O capabilities in a compact package suitable for hobbyist and professional prototyping.