The Rev3 has a single serial connection, shared by the USB port and the RX/TX pins. There's also only one I2C bus on the Rev3. In contrast, the R4 WiFi includes two serial ports and two I2C buses.

You’ll also need some jumper cables to interface the different parts of your Arduino project with the breadboard. While ...

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.

Arduwire UNO Arduino cable continuity tester. 12:23 pm March 30, ... After that, connect the Arduino to the PC or laptop and upload an example sketch using the Arduino IDE.