I. What’s it made of CPU — Arduino Lenoard board    (https://www.arduino.cc/en/Main/ArduinoBoardLeonardo)          The Arduino Leonardo is a microcontroller board. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, […]