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PIR Motion Detection Sensor - HC SR501

SKU: Y8LY53FY7A
★★★★ ★ ★
4.1 (94 reviews)
The HC-SR501 PIR Motion Detection Sensor is a passive infrared (PIR) sensor module designed to detect the motion of humans and animals by sensing changes in infrared radiation emitted by warm objects. The module incorporates a pyroelectric infrared sensor, BISS0001 motion processing IC, and a Fresnel lens, enabling reliable motion detection without emitting any infrared signals. This makes it a...
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The HC-SR501 PIR Motion Detection Sensor is a passive infrared (PIR) sensor module designed to detect the motion of humans and animals by sensing changes in infrared radiation emitted by warm objects. The module incorporates a pyroelectric infrared sensor, BISS0001 motion processing IC, and a Fresnel lens, enabling reliable motion detection without emitting any infrared signals. This makes it a low-power, highly efficient solution for motion sensing applications.

Operating from a 4.5V to 20V DC supply, the HC-SR501 provides a 3.3V TTL digital output whenever motion is detected. The module features adjustable sensitivity (up to approximately 7 meters) and adjustable output delay (typically 5 seconds to 300 seconds) using onboard potentiometers. It also supports Repeatable (H) and Non-Repeatable (L) trigger modes, allowing users to configure the module according to their application requirements. Compatible with Arduino, ESP32, STM32, Raspberry Pi, PIC, AVR, and other microcontrollers, the HC-SR501 is widely used in security systems, automatic lighting, smart home devices, robotics, and IoT projects.

Key Features

  • Passive Infrared (PIR) motion detection
  • Detects movement of humans and animals
  • Built-in BISS0001 PIR controller IC
  • Adjustable detection distance (up to approximately 7m)
  • Adjustable output delay time
  • Repeatable (H) and Non-Repeatable (L) trigger modes
  • Wide operating voltage range (4.5V–20V DC)
  • Low power consumption
  • 3.3V TTL digital output
  • Wide detection angle of up to 120°
  • Fresnel lens for enhanced detection coverage
  • High immunity to false triggering
  • Compact PCB with mounting holes
  • Easy interfacing with Arduino, ESP32, STM32, Raspberry Pi, AVR, and PIC
  • Ideal for security, automation, and occupancy sensing applications

Shipping & Returns

Orders placed before 3 PM IST will be shipped on the same day (excluding Sundays and Public holidays) through our shipping partners. In rare cases, the pickup may get delayed during Public holidays / Bandh / Environmental disturbances.

Specifications

Specifications:

Module Type: Passive Infrared (PIR) Motion Sensor Module
Model: HC-SR501
Sensor Type: Pyroelectric Infrared Sensor
Controller IC: BISS0001
Operating Voltage: 4.5V to 20V DC
Typical Operating Voltage: 5V DC
Quiescent Current: Less than 50µA
Output Type: Digital (TTL)
Output Voltage: 3.3V TTL (HIGH), 0V (LOW)
Detection Distance: Adjustable from approximately 3m to 7m
Detection Angle: Up to 120°
Output Delay Time: Adjustable from approximately 5 seconds to 300 seconds
Blocking Time: Approximately 2.5 Seconds (Default)
Trigger Modes: Repeatable (H) and Non-Repeatable (L)
Warm-Up Time: Approximately 30–60 Seconds
Operating Temperature: -20°C to +80°C
Lens Type: Fresnel Lens
PCB Dimensions: Approximately 32mm × 24mm × 18mm
Mounting Type: PCB Module with Mounting Holes
Compatibility: Arduino UNO, Nano, Mega, ESP32, STM32, Raspberry Pi, PIC, AVR, 8051 and other digital-input microcontrollers

Additional Resources

PIR Motion Detection Sensor.PDF

FAQ

1. What is the HC-SR501 PIR Motion Detection Sensor used for?

The HC-SR501 is used to detect the movement of people or animals in applications such as security systems, automatic lighting, home automation, robotics, occupancy detection, and IoT projects.

2. Can the HC-SR501 detect stationary objects?

No. The HC-SR501 detects changes in infrared radiation, so it responds to moving warm objects such as people or animals. Stationary objects generally do not trigger the sensor.

3. Is the HC-SR501 compatible with Arduino and ESP32?

Yes. The module operates from 4.5V to 20V and provides a 3.3V TTL digital output, making it compatible with Arduino, ESP32, STM32, Raspberry Pi, AVR, PIC, and other microcontrollers.

4. Can the detection range and delay time be adjusted?

Yes. The HC-SR501 features two onboard potentiometers that allow users to adjust the detection distance (approximately 3–7 meters) and output delay time (approximately 5–300 seconds) according to their application.

5. What is the difference between Repeatable and Non-Repeatable trigger modes?

In Repeatable (H) mode, the output remains HIGH as long as motion continues to be detected. In Non-Repeatable (L) mode, the output goes HIGH once for the selected delay period and ignores additional motion until the delay has elapsed.