This document provides information about the Arduino platform and its common characteristics for IoT applications. It describes the Arduino board, including its pin layout and functions. It then summarizes several Arduino board variants, including the Uno, Lilypad, Red Board, Mega, and Leonardo. The Uno has 14 digital pins with 6 PWM outputs and 6 analog inputs. The Lilypad is designed for wearables and e-textiles. The Red Board is flat for embedding. The Mega has more pins for more complex projects. The Leonardo has a microcontroller with built-in USB functionality.