This simple code lock circuit described here is of an electronic combination lock for daily use. It responds only to the roght sequence of four digits that are keyed in remotely. If a wrong key is ...

If your smart lock is connected to a voice assistant, be sure to use a PIN to unlock it with voice commands. It's a stretch, but it is possible to create workarounds with IFTTT to avoid using the PIN.

Build your own DIY cardboard security safe with a working code lock to keep your money or small valuables safe! 🏦🔒 In this step-by-step tutorial, you’ll create a functional cardboard mini-safe using ...