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This board converts a USB connection into 5 volt TX and RX that you can connect straight to the Arduino Mini or other microcontrollers, allowing them to talk to the computer.
Interfacing a PC with an Arduino Uno using serial communication allows you to send data from your computer to the Arduino, and vice versa, enabling you to control the Arduino or exchange information between the two. Checkout this blog to learn more.
playwithcircuit.com/interfacing-pc-with-arduino-uno-using...