PIR sensor detects a human being moving around within approximately 10m from the sensor. This is an average value, as the actual detection range is between 5m and 12m.PIR are fundamentally made of a pyro electric sensor, which can detect levels of infrared radiation.


When the sensor is idle, both slots detect the same amount of IR, the ambient amount radiated from the room or walls or outdoors. When a warm body like a human or animal passes by, it first intercepts one half of the PIR sensor, which causes a positive differential change between the two halves.

PIR Sensor for Arduino HC-SR501

SKU: SI_0004
    • Voltage: 5V – 20V

    • Power Consumption: 65mA

    • TTL output: 3.3V, 0V

    • Delay time: Adjustable (.3->5min)

    • Lock time: 0.2 sec

    • Trigger methods: L – disable repeat trigger, H enable repeat trigger

    • Sensing range: less than 120 degree, within 7 meters

    • Temperature: – 15 ~ +70

    • Dimension: 32*24 mm, distance between screw 28mm, M2, Lens dimension in diameter: 23mm