HC-SR501 PIR Motion Sensor Module


The PIR Motion Sensor Detector Module HC-SR501 allows you to sense motion. It is almost always used to detect the motion of a human body within the sensor’s range. It is often referred to as using “PIR”, “Pyroelectric”, “Passive Infrared” and “IR Motion” sensors. The module has an onboard pyroelectric sensor, conditioning circuitry, and a dome-shaped Fresnel lens. It has a delay time adjustment Potentiometer and sensitivity adjustment Potentiometer. Repeat Trigger Selection solderable Jumper is also available.


  • Infrared Sensor with Control Circuit Board
  • The Sensitivity and Holding Time Can be Adjusted
  • Blockade time: 2.5s (Default)
  • Sensitive Setting: Turn to the Right, Distance Increases (About 7M); Turn to the Left, Distance Reduce (About 3M)
  • Time Setting: Turn to the Right, and Time Increases (About 200S); Turn to the Left, and Time Reduces (About 5S).


Pin NamePin Description
VccThe input voltage is +5V for typical applications. Can range from 4.5V- 12V
High/Low Output (Dout)Digital pulse high (3.3V) when triggered (motion detected) digital low(0V) when idle(no motion detected
GroundConnected to the ground of the circuit


Voltage5V – 20V
Power Consumption65mA
TTL output3.3V, 0V
Lock time0.2 sec
Temperature– 15 ~ +70


  • Intrusion detection system: Detects human presence for security purposes.
  • Smart lighting control: Controls lighting based on human presence to save energy.
  • Automatic doors: Opens doors automatically when someone approaches.
  • Occupancy monitoring: Counts the number of people present in a space for crowd management.
  • Energy-efficient heating/cooling systems: Optimizes temperature control based on occupancy.
  • Wildlife monitoring: Detects the presence of animals in specific areas.
  • Home automation: Automates functions based on human presence.
  • Interactive installations: Triggers effects when someone enters a specific area.
  • Smart retail displays activate or change content when customers approach.
  • Motion-activated cameras: Triggers cameras to record or capture images based on movement.


Download the Datasheet of the HC-SR501 PIR Sensor Module from the link given below.