u/PSV62

This small souvenir safe is equipped with an electric combination lock made from a seven-segment display. The lock latch is driven in a completely unconventional way – by a tiny micromotor typically used to create vibrations in phones. Because this micromotor can operate from a single 18650 lithium-ion battery, I was able to greatly simplify the entire electrical circuit. The entire electrical component consists of the battery, micromotor, 8 microswitches, and wires with connectors. I solved the problem of matching the high-speed but low-power micromotor with the slow-moving lock latch by using a flywheel made from a rubber wheel from a children's toy car.

When cycling or scootering at night, it's advisable to wear reflective clothing. Magnets secure the quick-release reflective element, which is important for preserving the waterproof fabric of your windbreaker or backpack.

I join the ranks of developers of seven segment digits for 3D printing, who are expanding their range.

If the remarkable, albeit very ancient, Archimedes screw is used to lift water, an external power source is required (such as engines, draft animals, or even people). I designed and built a screw with a specially shaped impeller. Even with a weak current, this screw lifts water on its own, without any external assistance.