PIERRE Contact sensors are integral components of the PIERRE smart home system, designed to monitor the opening and closing of doors, windows, and other movable barriers, thereby enhancing home security. These sensors detect when a door or window is opened or closed and transmit this information to the system, allowing homeowners to receive real-time alerts and track the status of these entry points. By integrating these sensors into the smart home system, users can significantly improve their security measures and maintain greater control over access points throughout their home.