I feel quite ashamed to ask this question but please tolerate the ramblings of an older fool. I have the starter kit and I've done the so-called Spaceship Interface chapter. There's no need to dwell on the wiring of it except to encapsulate one example from the chapter where pin 5 on the Uno goes in…

Where to place a resistor.

Grumpy_Mike May 12, 2014, 9:48am 10

That is why it is irrelevant as to what direction current actually flows in.

Topic		Replies	Views
Component Placement in a circuit Frequently-Asked Questions	12	2341	May 6, 2021
Placing resistor AFTER LED. Why? General Electronics	11	4406	May 6, 2021
Resistance and LED: on the anode or on the cathode? General Electronics	7	7227	May 6, 2021
Have a Question regarding resistors and placement Frequently-Asked Questions	6	2452	May 6, 2021
Reason for not using resistor to LED General Guidance	22	6124	May 5, 2021