PIR Motion Sensor HC-SR501



The HC-SR501 Infrared PIR Motion Sensor Module auto-senses light in various applications (in house, basement, outdoor, warehouse, garage, etc,) for ventilator control, alarm, etc. Infrared technology (LHI778 probe design) high sensitivity & high reliability. ultra-low-voltage. widely used especially for battery-powered products. This HC-SR501 Infrared PIR Motion Sensor Module uses the LHI778 Passive Infrared Sensor and the 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, also includes time delay adjustments and trigger selection that allow for fine tuning within your application. 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 Infrared PIR Motion Sensor Module has three output pins Vcc, Output and Ground as shown in the pin diagram above. Since the output pin is 3.3V TTL logic it can be used with any platforms like Arduino, Raspberry, PIC, ARM, 8051 etc.. For most of our Arduino projects that need to detect when a person has left or entered the area, or has approached, HC-SR501 Infrared PIR Motion Sensor Module is a great choice. They are low power and low cost, pretty rugged, have a wide lens range, easy to interface with and are insanely popular among hobbyists. HC-SR501 Infrared PIR Motion Sensor Module has three output pins VCC, Output and Ground as shown in the diagram below. It has a built-in voltage regulator so it can be powered by any DC voltage from 4.5 to 12 volts, typically 5V is used. Other than this, there are a couple options you have with your PIR. Let’s check them out.


  • Wide range on input voltage varying from 4.V to 12V (+5V recommended)
  • Output voltage is High/Low (3.3V TTL)
  • Can distinguish between object movement and human movement
  • Has to operating modes – Repeatable(H) and Non- Repeatable(H)
  • Cover distance of about 120° and 7 meters
  • Low power consumption of 65mA
  • Operating temperature from -20° to +80° Celsius
  • Automatic Street/Garage/Warehouse or Garden Lights
  • Burglar Alarms
  • Security cams as motion detectors
  • Industrial Automation Control


  • Operating Voltage (VDC): 4.5 ~ 20
  • Average Current Consumption (mA): 0.06
  • Distance Measuring Range (CM): 300 ~ 700
  • Output Type: (High/ Low-level Signal) 3.3V TTL output
  • Working Temperature Range (°C): -20 to 80
  • Detection Angle: <140°
  • Delay Time: 5 to 200s (Can be Adjusted, Default 5s +/- 3%)
  • Dimensions: 32 x 24 x 18
  • Additional information
  • Gross weight: 14 g
  • Manufacturer part number: HC-SR501


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