Detect Nearby Objects Without Contact

The PIR Motion Sensor Module Digital HC-SR501 is a proximity presence sensor module with digital output designed for presence sensing, short-range detection, and touchless automation. It is a practical fit for makers, students, and engineers who want reliable sensor data in embedded builds.

Key details include Input Voltage: DC 4.5-20V; Output: 3.3V.

Why you’ll love it

Optional temperature compensation: Optional temperature compensation
Key feature: Output goes high when objects enter the sensing range, and automatically returns to low when an object leaves.
Wide operating voltage range: Wide operating voltage range
Current draw: 50uA
Controller output: 3.3V
Power range: DC 4.5-20V

Compare with similar products

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PIR Motion Sensor Module Digital HC-SR501	proximity presence sensor module with digital output	Current item
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Acrylic Bracket for HC-SR501 PIR Sensor	proximity presence sensor module	model HC-SR501
PIR Motion Sensor HC SR505	proximity presence sensor module	digital output, infrared sensing

What you can build

This sensor is a good fit for touchless dispensers, object counters, door triggers, small robots, and presence alarms.

Starter bundles

Pair it with an Arduino-compatible board, ESP32, or Raspberry Pi, plus a breadboard and jumper wires for quick setup and testing.

Recommended add-ons

Useful add-ons include a microcontroller board, jumper wires, and pull-up or pull-down support when needed, depending on how you plan to power, mount, and log the sensor.

Technical specifications

Product	PIR Motion Sensor Module Digital HC-SR501
Static current	50uA
Output	3.3V
Output high signal	easy to attain docking with the various sorts of circuits.
Output signal	0,3V or 5V (Output high when motion detected)
Input Voltage	DC 4.5-20V
Repeatable	PIR Module HC-SR501 sensor stays high as long as an object is detected during the delay time.
Sentry Angle	110 degree
Non-repeatable	PIR Module sensor gets downward after the delay, irrespective of the presence of the object.

Wiring & usage notes

Connect power and ground, then wire the output pin to a digital GPIO input. Check whether the module uses active-high or active-low logic in your code.

What’s in the box

1 × PIR Motion Sensor Module Digital HC-SR501

Frequently Asked Questions

What does the PIR Motion Sensor Module Digital HC-SR501 measure? It is designed to measure nearby objects, remote IR signals, or motion.

Can I use it with Arduino, ESP32, or Raspberry Pi? Yes. It is well suited for common maker and embedded platforms, as long as you power it at the correct voltage and match the signal level to your controller.

How do I connect this Digital GPIO sensor? This sensor provides a digital switching-style signal that is easy to read from a GPIO pin.

What affects accuracy? Power quality, wiring, mounting, target material, and the real environment can all affect the reading. It is best to test and calibrate in the final setup.

Is it good for prototyping? Yes. It is a practical choice for learning, proof-of-concept builds, and small automation projects.