So you need a fence gate, and you've started to think about hardware. Well, think carefully, because it can make or break ...

Here’s a really fascinating circuit that implements a combination lock using relays and logic gates. Even with the schematic and written explanation of how it works we’re still left somewhat ...

Prism+ is best known for displays, not locks — and putting a hole in your door for an experiment isn't for the faint of heart. But that's what I did, so you don't have to be a guinea pig. Thankfully, ...