Each of the 14 digital pins on the Arduino Uno can be used as an input or output ... These pins are connected to the corresponding pins of the ATmega8U2 USB-to-TTL Serial chip. PWM: 3, 5, 6, 9, 10, ...

A few other distinctions you'll notice between the two boards' pinouts are that ... Both the Arduino Nano and Uno can be powered via their integrated USB connectors. This automatically supplies ...

now dubbed the Arduino Uno. It's of course backwards compatible with existing Arduino add-ons, but sets itself apart with a new USB controller with lower latency and driver-free operation on Mac ...

However, while the Uno is a helpful board ... a shrunken version of the Arduino Leonardo as it features the same ATmega32U4 microcontroller, micro-USB port, and pinouts. It also operates at ...