Original circuit 1 video
Circuit 1 original code
Manipulated circuit 1 video
Circuit 1 manipulated code
I changed the first digital write from HIGH to LOW and the 2nd digital Write from LOW to HIGH .The delay has been changed to 10 millisecond ,So the blink was so quick you couldn't see it
Circuit 2 Circuit with Potentiometer
Process
Code for Circuit 2 - Potentiometer to work
The original definition of a potentiometer
Circuit 3 code
Potentiometer in circuit 2 in play video