Raspberry Pi and Arduino - Go to The Next Level - Debug Serial Communication if Can’t Connect

This tutorial addresses common issues with serial communication between an Arduino and a Raspberry Pi. It covers debugging steps, such as checking USB connections and port settings, and explains how to resolve 'device busy' errors by ensuring only one program uses the serial communication at a time. The tutorial also emphasizes the importance of uploading the correct program to the Arduino and initiating the signal properly.

Why is it important to ensure only one program is using serial communication at a time?

What must be done before trying to communicate with an Arduino from a Raspberry Pi?