On our last post we built and used a sound trigger to shoot a crossbow shoots an egg, today we add a photo gate trigger and shoot things falling.
After using the original trigger circuits for quite a while, I decided to make some improvements and to amalgamate the various devices into one, and to finally “hard wire” the whole lot. My excuse was that while I was incorporating the improvements I could rationalize the kit, but to be honest this was a bit of a vanity project. The finished control box is better, and much more versatile, and has enough knobs and switches to impress the unwary, but functionally the quick-and-easy separate circuits are just as good!
So, you can treat this post as a bit of a vanity project too, and skip it completely unless you are a inveterate tinkerer yourself![Read More…]