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HC-SR501 PIR Motion Detector Sensor Passive Infrared Receiver Module

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HC=SR501 PIR Motion Detector ModuleThis PIR Motion Detector Receiver Module is designed for use with microcontrollers such as Arduino, Digispark, and Raspberry Pi.

It can be used for automatic-on lighting, automatic starting, anti-theft security alarm, and many other motion detection applications.

It features adjustable sensitivity that allows for a motion detection range from ~9 feet to 21 feet (3 meters to 7 meters) within a cone of about 120 degrees from the front of the Fresnel lens, and also includes time delay adjustments and trigger selection that allow for fine-tuning within your application.

HC-SR501 Specifications:

  • Working Voltage: 5V to 20V DC
  • Static (quiescent) current: 65uA
  • Output signal: High level 3.3V, low level 0V
  • Time Delay: Adjustable (3s~300s)
  • Blockage time: 0.2s
  • Detectable Area: <120°/7M (max)
  • Sensitivity: Adjustable
  • Operating Temperature: -15° to +70°C
  • PCB Size: 32mm x 24mm (1.27″ x 0.96″)
  • Induction Lens Size (Diameter): 23mm
HC-SR501 Motion Detector Module Pinout

HC-SR501 Pinouts and Controls

The time delay adjustment determines how long the output of the PIR sensor module will remain high after motion detection.  The range is from about 3 seconds to 5 minutes.

The Sensitivity Adjustment varies the range from approximately 9 feet to 21 feet (3 to 7 meters).

The trigger mode selection jumper allows you to select between single and repeatable triggers.  The effect of this jumper setting is to determine when the time delay begins.

  • SINGLE TRIGGER – The time delay begins immediately when motion is first detected.
  • REPEATABLE TRIGGER –  Each detected motion resets the time delay.  Thus the time delay begins with the last motion detected.

HC-SR501 PIR Detector Functional Description

The HC-SR5011 PIR Sensor module allows you to sense motion. It is often called a PIR, Pyroelectric, Passive Infrared, or IR Motion sensor. The module has an on-board pyroelectric sensor, support circuitry, and a dome-shaped Fresnel lens. The PIR sensor module provides an output “HIGH” when a body is detected within its range, and an automatic delay “LOW” when the body leaves its range. The delay time is adjustable using the potentiometer on-board. The minimum delay time is 3 seconds and the maximum is 300 seconds.

HC-SR501 Schematic

HC-SR501 Schematic

Additional Resources

How to use HC-SR501 PIR Motion Sensor with Arduino on Makerguides

HC-SR501 review from JohnAudioTech on Youtube:

HC-SR501 Motion Sensor Tested on Chinese Electronic Products Tested blog:

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