LED circuit with Arduino

With 1 LED...

The final project with 2 yellow LEDs and 1 white LED

Katie and I worked together to make the LED light turn on and off. After having 1 LED, we added 1 more and a white LED. At first we couldn't figure out how the white LED worked since it had 4 legs instead of 2, but then we added 3 more wire and resisters and it worked.