I have drooled over Arduino for years and have just never been able to get beyond the basics. I want to build an air cannon to shoot rubber chickens. I have an idea that will use a compressor with tank, an secondary (much smaller tank) A normally open valve and a normally closed valve. I have included a picture. Is there way to do this with only one valve rather than two? I have looked at several sites talking about 4 and 5 way valves but none look like what I need.