Create Christmas Light Effect With 3 LEDs, 3 Resistors, No External Power and Two Set of Effects. Circuit written in code. Again here -
LED1 ---(+)---[200 Ohm Resister]---- Pin 8
LED2 ---(+)---[200 Ohm Resister]---- Pin 7
LED3 ---(+)------------------------- Pin 12
LED1, LED2, LED3 ----(-)----[10K Ohm Resister]--- GND
Video demo - https://www.youtube.com/watch?v=Sl1ewWLf41s