From Knight of Pi:
The Raspberry Pi enables building sophisticated alarm systems for a low price and with comparably low effort. The alarm system presented herein detects if a specific bluetooth device (e.g. smartphone) is present. If a PIR (passive infrared) motion sensor detects movement and the smartphone is not present, an piezo-buzzer is activated. This is easily extendable, for example by triggering sms alerts. Thanks to Rob Zwetsloot and the MagPi for the idea!
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