Motion detection with Raspberry Pi 3 PIR sensor

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Motion detection with Raspberry Pi 3 PIR sensor

What is a PIR sensor?
As we know, the PIR sensor is a practical sensor that is often used in motion detection. Both ends of the reed relay are normally open. When a magnetic object approaches the reed relay, this effect causes the contacts of the reed relay in the glass tube to touch and short both ends.

Raspberry Pi – Reed relay and PIR sensor circuit: