You'll typically only work with a few of its main parts: the USB port, power port, reset button, and pins. ... the site even allows you to browse through projects that only use an Arduino UNO.

To build this project, all you need is three main components: an Arduino Uno, a 16x2 LCD, and a push button. You can connect everything to a breadboard to keep it simple.

Each of the 14 digital pins on the Arduino Uno can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. They operate at 5 volts. ... Typically used to add a ...