Robot mounted air cannon

[math311]

Last year the seniors on the team built an air cannon, well sort of. They built the tanks, which are linked together with a splitter, and then attacked an electronic valve. Then they left for college. At the moment we have a 2 or 3 inch barrel, and that could work. problem is, we have nothing else for the cannon. We have last years bot to mount it, but it has no code for pneumatic s, and the only programmer on our team right now does not think they know how to make it work. Does anyone know what we need to do to make it robot controlled, so we can drive and shoot t-shirts?