Detonator fireworks launcher

thingiverse

##This design I created this using scraps already around the house, The switch design in particular could be done a number of ways differently depending on the switch used. Consider this more a general guide than an exact recipe to follow. ##Power Supply I wanted to use my existing Ryobi tool batteries, so I [used this design](https://www.thingiverse.com/thing:1194867/files). Other choices that would work depending on your igniters would be an RC lipo battery, 6v lantern battery, etc. Some of those could fit inside even unlike my ryobi battery. ##Bill of Materials Besides these printed parts, you will need: * A wood tissue box cover from Michaels (or similar) [available here](https://www.michaels.com/wood-tissue-box-by-artminds/10399005.html) * 5/8" dowel * 1" conduit * Standard light switch * A spring of suitable size * Hot glue * Bolts & nuts * Wire ## General instructions * Print "top plug" and glue into the oval hole in the box. * Print the switch plunger, switch plug * Cut a length of conduit to fit inside the box, about 5" was right for me. * Sand the inside of one end of the conduit to fit over the lip around the center hole of the top plug. * Cut a slot in the side of the conduit to fit the light switch, allow room for spring and plug. For me this but the bottom of the switches metal "wing" approximately even with the bottom of the tube. * Insert the switch plunger into the conduit, aligning the square hole with the slot you cut. * Insert the switch into the slot, the lever of the switch should fit into the square hole in the plunger, and while holding the switch in place you should be able to flip it by pressing the plunger with your dowel. Once satisfied with placement and nothing is binding, zip tie the switch to the conduit. * Add your spring and plug, and test how far in it needs to be pressed to reliably open the circuit when the dowel isn't pressing on it. This will depend entirely on the spring you use. I suggest hooking a multimeter to the switch and testing a bunch of positions, making sure it both activates and stops. * Once your position is found, lock the plug in place with hot glue. * Drill corner holes that fit your bolts attach wires with washers/nuts and insert from inside of hole. * Hot glue switch assembly to the top lid. * Connect your wires. Battery polarity doesn't matter. Circuit should look like: Bolt 1 <-> switch <-> battery <-> bolt 2 * Switch support is optional depending on how long you cut the conduit. I had a gap and wanted to support it with the sliding cover, you can adjust the thickness of the support to match how much space you need to cover.