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Proximity

Proximity and motion sensors: HC-SR04 ultrasonic, PIR HC-SR501 and HC-SR505, RCWL-0516 and LD2410 radar, inductive proximity sensors and E18-D80NK IR switch.

Sensors that detect people and objects: HC-SR04 and waterproof AJ-SR04M ultrasonic distance sensors, HC-SR501 and HC-SR505 PIR motion sensors, 230V PIR switches, RCWL-0516 microwave radar, HLK-LD2410 24GHz human presence radar that also detects people sitting still, NPN and PNP inductive sensors for metal, and the E18-D80NK adjustable IR switch.

Which sensor?

To measure distance, ultrasonic. To detect a person walking into a room, PIR. To detect someone who is sitting still, the LD2410 radar. To detect metal parts on a machine, an inductive sensor. Inductive sensors usually need 6-36V, so check how you’ll connect their output to a microcontroller.

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