PIR Motion Sensor Module – SR501

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The PIR Motion Sensor Module – SR501 is a device used to detect motion in a room or area. It operates by using a passive infrared sensor to detect changes in the infrared radiation levels in its field of view, indicating the presence of a moving object. The module is small and compact, making it suitable for a range of applications, such as home automation, security systems, and robotics. The module outputs a digital signal, making it easy to interface with microcontrollers and other electronics.

Price: $6.54 (GST inclusive)

13 in stock (can be backordered)

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SKU: Sensor-Mod-PIR Categories: ,

Description

The PIR Motion Sensor Module – SR501 is a device used to detect motion in a room or area. It operates by using a passive infrared sensor to detect changes in the infrared radiation levels in its field of view, indicating the presence of a moving object. The module is small and compact, making it suitable for a range of applications, such as home automation, security systems, and robotics. The module outputs a digital signal, making it easy to interface with microcontrollers and other electronics.

Features:

  • Passive infrared sensor (PIR sensor)
  • Operating voltage: DC 4.5V ~ 5V
  • Quiescent Current: <65uA
  • Output: High level 3.3 V; Low level 0V
  • Delay time: 5-200S(adjustable)
  • Trigger mode setting: L=Not repeated(default); H=Repeated
  • Block time 2.5S(default)
  • Board Dimensions 32mm x 24mm
  • Sensing Angle: < 120° cone angle
  • Operation Temp. -15 ~ +70 degrees

How the PIR Sensor Work

  • The PIR sensor itself has two slots in it, each slot is made of a special material that is sensitive to IR.
  • 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. When the warm body leaves the sensing area, the reverse happens, whereby the sensor generates a negative differential change. These change pulses are what is detected
  • The IR sensor itself is housed in a hermetically sealed metal can to improve noise immunity.
    There is a window made of IR-transmissive material (typically coated silicon since that is very easy to come by) that protects the sensing element. Behind the window are the two balanced sensors

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1 review for PIR Motion Sensor Module – SR501

  1. Robo Admin T –

    Cheap and good quality product

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The PIR Motion Sensor Module – SR501 is a passive infrared (PIR) sensor module used to detect human movement within its sensing range. It is commonly used in projects and applications that require motion detection, such as security systems, automatic lighting, and occupancy sensing. The SR501 module includes a pyroelectric sensor, a Fresnel lens, and supporting circuitry to detect infrared radiation emitted by moving objects.

  1. The SR501 PIR Motion Sensor Module works based on the principle of detecting changes in infrared radiation emitted by living organisms. Here’s a simplified explanation of its operation:

  • The module includes a pyroelectric sensor that can detect small changes in infrared radiation.
  • When a human or warm-blooded animal moves within the sensor’s range, it emits infrared radiation that changes the temperature pattern in its surroundings.
  • The Fresnel lens on the module focuses the infrared radiation onto the pyroelectric sensor.
  • The sensor converts the detected changes in infrared radiation into electrical signals.
  • The supporting circuitry amplifies and processes the electrical signals to determine the presence of motion.
  • The module provides a digital output signal that indicates motion detection, which can be used to trigger actions or control other devices.
  1. To use the PIR Motion Sensor Module – SR501, follow these steps:
  • Connect the VCC pin of the module to the power supply voltage (typically 5V or 3.3V) of your microcontroller or circuit.
  • Connect the GND pin of the module to the ground (GND) of your microcontroller or circuit.
  • Connect the OUT pin of the module to a digital input pin of your microcontroller or circuit. This pin will receive the motion detection signal.
  • Adjust the sensitivity and time delay settings, if available, using the potentiometers on the module.
  • Write the necessary code in your microcontroller or development board to monitor the digital input pin and perform desired actions when motion is detected.

It’s important to consult the datasheet or documentation specific to your PIR Motion Sensor Module – SR501 for detailed pin configurations, specifications, and usage instructions, as they may vary slightly depending on the manufacturer.


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