thermal detonator class-A
thingiverse
First, install four 3mm LEDs within the button and three holes. Once cleaned up, the button should slide smoothly through the hole. Next, install a small pushbutton underneath the button and secure it firmly in place inside the thermaldetonator. After wiring everything together, attach some magnets to the inside edge (you can also glue the two halves permanently if you don't need access again). I powered this entire project with a 9V block battery and used an affordable China-made Arduino Nano clone.
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