You don't have to spend a fortune on security -- DIY smart home security is affordable and effective with Aqara devices and other integrations. Aqara Door and Window ...

This compact and affordable door sensor mechanism uses a Hall-effect sensor fixed at the corner of the door frame and a standard bar magnet fixed on the door panel close to the Hall-effect sensor.

This circuit uses a thin piezoelectric sensor to sense the vibrations generated by knocking on a surface; eg, a door or table. Basically, it amplifies and processes the signal from the sensor and ...

Mirabella is continuing to expand its range of low cost smart home devices, and one of the latest is a Wi-Fi enabled Door & Window Sensor that’s available for $25 at Kmart. This is not a complicated ...