>This Minecraft TNT cannon is semi-automatic, once you press the button, it not only lights up the “boosters” but also sends a minecart around the cannon that triggers a detector rail, which lights up the charge. Saves redstone, but takes a lot of iron (However, if you get rails from abandoned mineshafts this design can even save you resources!).
Actually the idea of making this came to my mind around 1 year ago, and I made a video about it and uploaded on my other channel. A few months back I deleted my other channel and lost the video.