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PIR Motion Sensor HC-SR501

PIR Motion Sensor HC-SR501

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PIR Motion Sensor HC-SR501

PIR motion sensor works by constantly comparing the level of infrared radiation (IR) of the surrounding are, this allows the sensor to detect motion, these sensors are commonly used for home automation, such as automated lighting systems, and security systems.

This particular PIR motion sensor module uses LHI778 Passive Infrared Sensor and BISS0001 IC to control how motion is detected. The module features adjustable sensitivity that allows for a motion detection range from 3 meters to 7 meters, and a time delay adjustments and trigger selection that allow for fine tuning within your application.

This product can work on its own in conjunction with a relay module even without a microcontroller, however if you want to add more functionality than just turning on a device, you will need an Arduino.

PIR Motion Sensor HC-SR501 Motion Detector Pin Outs

Pin or Control Function
Time Delay Adjust Sets how long the output remains high after detecting motion 5 seconds to 5 minutes.
Sensitivity Adjust Sets the detection range 3 meters to 7 meters
Trigger Selection Jumper Set for single or repeatable triggers.
Ground pin Ground input
Output Pin Low when no motion is detected, High when motion is detected. High is 3.3V
Power Pin 5 to 20 VDC Supply input

HC SR501 Sensitivity Adjust


  • Voltage: 5V – 20V
  • Power Consumption: 65mA
  • TTL output: 3.3V, 0V
  • Delay time: Adjustable
  • 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