In the scope of this tutorial, we’ll measure distances and trigger an alarm using PubNub Pub/Sub Messaging and Raspberry Pi. The alarm will send an alert to a web interface in realtime when the motion sensor is triggered. – See more at: http://www.pubnub.com/blog/building-a-raspberry-pi-motion-sensor-with-realtime-alerts/#sthash.TWLDGE6L.dpuf
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