Make something [NYC Police Sirens]

I also followed the book for this exercise; I seem to retain more information when I read examples directly from the Arduino projects book.  I switch between the resources online and the physical book – this is extremely useful and helpful for me. I used a Pushbutton switch and three LED’s (red, blue, white), 3 220 OHM resistors, and 1 10 K ohm resistor to replicate NYC police sirens. The code was pretty straight forward but I added an extra 100 delay to create the flickering effect between the white and blue LED’s.