It’s the first we’ve heard of it, but a New Year’s Eve tradition in The Netherlands called Carbidschieten sounds like it’s just up our alley. Basically, a small chunk of calcium carbide and a little bit of water is placed in a metal milk churn. The carbide decomposes into acetylene and a flame is held up to a small hole in the milk churn. The resulting explosion sends the lid of the milk churn across a field and much fun is had by all.
[Edwin Eefting], [Johan Postema], [Elger Postema] are exploding 1000 liters of acetylene this New Years and needed a safe way to detonate their celebration. They came up with an electronic ignition system based on an Arduino that probably makes just as much noise as the explosion itself.
The build is basically an Arduino with a few relays. When a pair of buttons are pressed for longer than a second, the Arduino goes into countdown mode with the requisite alarms and ringing bells. When it’s time to fire the carbide cannon, a power supply is turned on that heats up a glow plug, igniting the acetylene. It’s a great build, and adds an adequate amount of safety for an event involving exploding 1000 liters of acetylene.
You can check out the videos of the countdown timer after the break, or check out the Facebook group here.