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This instructable helps you to build a simplified tracking system and was inspired by beacon technology. In this case, the Ultrasonic rangers are functioning as/mimicking beacons, and the LCD screen as the screen of your mobile phone. The prototype notifies you when movement is detected, and if detected, whether the movement was to the right, to the left or unknown. The latter was added in case the person (or object) passing by just passes one ‘beacon’ because he could either stopped moving in the middle, walked another direction where there was no beacon or walked back without passing another beacon except for the one he already passed.”

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