Just a very quick video showing how this simple rocket ignition module works.
My module is 4 years old and no longer made, but here is a similar one I found. https://goo.gl/Zcncy2 (just keep in mind these are a pain in the billiards to program and dont come with instructions. So a multimeter is a necessity).
Stay safe and never stop learning!
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https://www.youtube.com/watch?v=BMZNB8sUs6k