sbright33:
Here is the newest version for 28BYJ-48.Stepper library for 28BYJ-48 · GitHub
12v is reliable, you just have to mind the heat. This means you cannot run at full speed for 20 minutes. You can go slow forever using the "cool" functions. Or go full speed then stop to let it cool down.
For sure there's something that I didn't understood but, after using, with success, the first sketch on this post, I'm trying the last one without obtaining nothing of good. The four red leds on the PCB stay fixed without blinking.
In the setup there's no declaration of potentiometer to drive the motor. Is there something, due to my ignorance, that I miss? Thank You!