If the card is on the list, the Pi triggers the door lock using a signal line originally designed to work with an intercom system. If the user isn’t on the list, a laser is triggered that ...

This is a hotel room door swinging open. The device he holds in his hand is an Arduino ... through the system. We’re no strangers to easy hotel beak-ins. But how can a digital lock possibly ...

Linking the Arduino to another device, such as a speaker, will allow you to set up a chime that will trigger if the door is rattled. If your security system ... person to do. Using foam board ...