It's easy enough to use your Raspberry Pi as a webcam or as a security camera that you look at in real-time, but what if you just want to be notified when your Pi sees motion? You can attach a passive infrared sensor (PIR) to act as a motion detector and then program your Raspberry Pi to send an alert to IFTTT (If This Then That), a web service that gets inputs from devices and acts on them.
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