Lab: Using a transistor to control high current loads with an Arduino
Lab link is here.
The motor, without a “rotation indicator”, was hard to tell whether the speed was changing or not. And it did seem not changing according to the sound it made. Troubleshooting is needed in the coming week.
Transistor from Xinran Wang on Vimeo.

Let me know if I can help! But we will be doing this in class today so hopefully that will clarify!
That would be helpful! Thanks!!
Did, what we did in class, help clarify? Did you have a chance to try the lab again? Thanks for sharing your lab and let me know if I can help with anything that is still confusing or not working properly. B_