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This paper presents the design and implementation of a security system in which a mobile robot Lego NXT continuously monitors its surroundings while traveling in search of moving objects or people, considered unauthorized elements. An ultrasonic sensor is used for the monitoring. On suspicious movement detection, a warning signal is sent to a computer via Bluetooth technology. The mobile robot motion is observed with a camera that sends images to the computer controlling the robot remotely. The results indicate that the security system is reliable in 85% of cases.
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