Rocket Altimeter Pull-Pin Switch

thingiverse

An Easy-To-Make Housing That Holds A Standard 20mm Lever-Type Microswitch. You Can Find This Housing On eBay Here: https://www.ebay.com/itm/Short-Straight-Hinge-Lever-Mini-Micro-Switch-AC-5A-125V-3A-250V-20-x-5mm-E2115/350855793144?epid=1962851861&hash=item51b0a289f8:g:GtoAAOSw9uFW8mIp Or Try This One On Digikey, It's Probably Better Quality: https://www.digikey.com/product-detail/en/e-switch/ms0850502f020s1a/eg4542-nd/1628279 The Switch Mounts In The Housing Using #2 Screws And Nuts (Or Metric Equivalent - 2 Or 2.5mm). A 1/8" Diameter Pin Is Inserted In The Hole To Trigger The Switch. When Wiring Up Your Rocket Electronics, Be Sure To Connect Them To The "Normally Closed" Side Of The Switch. This Way, The Circuit Will Remain Off When The Pin Is Inserted. It's Extremely Important To Add A "Remove Before Flight" Flag Of Some Kind On The Pin. PLA Should Work Just Fine For Printing This Housing, But ABS Or PETG Will Be Even More Durable If You Need It To Last. Please Keep In Mind That This Design Has Not Yet Been Put Through Any Real-World Testing. There Are Similar Designs Out There, But Use Them At Your Own Risk.