I love this project! In the spirit of sharing ideas, I would have probably done this full analog. I’d set up a rudimentary analog break beam detector (like what

I love this project! In the spirit of sharing ideas, I would have probably done this full analog. I’d set up a rudimentary analog break beam detector (like what they use to detect if a garage door is cleared to close) beaming across the balcony, and if so, trigger the relay to shoot the gun!