EasyLights
I was working on my Picaxe 28x2 robot from http://letsmakerobots.com/ and I wanted lights and I needed more sensors. I had four input pins left. With the 28x2 you can make the pins anything that you need. I went back to electronics to find some answers. I looked up shift registers on http://www.jameco.com/ and I bought the latest CD74HC164 serial in parallel out. This is why I made Easy Lights. For two pins you get eight lights. Yes there is a little flicker. It is a shift register. Each time the lights change you have to shift in all eight lights.