25w09 Continued Learning Serial Communication with Arduino

We have started another new Learning Package LP2508: Starting Experience of C++ with Arduino, 25w08, as a continuation of last LP2504: First Experience with Arduino, 25w04, it's time to try learning some solid basic knowledge of C++, and it's the first time we seriously take up the textual coding, instead of the graphical blocks dragging. Some students are very excited, and try different programs by themselves, after finishing our planned tasks, they said "It's too simple!", well, it might be, but we still need to take the structural learning step by step... And, let's be humble, we don't know well enough for some details yet, keep learning with a serious and humble attitude.