WhatsApp introduced a Chat Lock feature for iPhones and high-end and budget Android phones to make your conversations more private. The only limitation of this feature is that chats appear in a Locked ...

To lock or hide WhatsApp Chats with secret code, send the chat to Locked folder, lock it using a code, then hide it, Follow the guide to do the same.

The project is a Raspberry Pi-controlled fingerprint lock, which Joyce uses as part of a servo-powered latch to keep a box locked until the correct person scans their finger.