The first part involved adding the power supply, which in this case was 12 V that got converted to 5 V through a voltage regulator. This was verified by a multimeter at just under, at 4.97 V.
The second part was the addition of an LED. In this case, I used a 220-ohm resistor immediately preceding it, with a switch before that.
Parts three and four are short studies in arranging components in serial and in parallel. In the first photo the LEDs light; they should have the same voltage between them, but in this case there was a 0.2 difference between them (2.6 in the first, 2.4 in the second). The third LED lowered their voltages too low to light the LED but with three in parallel they worked fine, with about 3.85 V across each.
In the last part I inserted a potentiometer to control the LED's brightness. The blue line is the pot's output, which goes through the same resistor as above before the LED.
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