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PIR Sensor

HC-SR501 PIR Sensor
HC-SR501 PIR Sensor

HC-SR501 PIR Sensor

The PIR sensor stands for Passive Infrared sensor. It is a low cost sensor which can detect the presence of Human beings or animals. This HC-SR501 PIR sensor module has three output pins Vcc, Output and Ground as shown in the pin diagram above.
EKMB and EKMC Series PIR Motion Sensors
EKMB and EKMC Series PIR Motion Sensors

Compact Low-Profile Flat Square Lens Type Passive Infrared or Pyroelectric Motion Sensors for Electromagnetic Shielding of Circuitries

Panasonic has expanded its lineup of EKMB and EKMC Series with the introduction of the “Flat Square Lens” Passive Infrared (PIR) Motion Sensor Line Extension.
HC-SR505 PIR Sensor
HC-SR505 PIR Sensor

HC-SR505 PIR Motion Sensor Module

HC-SR505 is mini PIR (Passive Infra Red) motion sensor module, which as the name implies used for detecting the motion of a body in front of it.