Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	HC-SR501
Operating Voltage	DC 4.5V - 20V
Detection Distance	Up to 7 meters
Detection Angle	< 100 degrees cone angle
Trigger Mode	L (Low) and H (High) selectable via jumper
Delay Time	Adjustable from 5 seconds to 300 seconds
Blockade Time	Fixed at 2.5 seconds (default)
PCB Dimensions	32mm x 24mm
Sensor Type	Pyroelectric Infrared (PIR)
Output Signal	High level 3.3V / Low level 0V

6 reviews

Anonymous

Mar 26, 2026

Rating: 4/5

Solid performance

Does exactly what it says on the tin. The L/H trigger mode jumper is a nice feature for different application logic. Only wish the cables were included.

Anonymous

Mar 20, 2026

Rating: 5/5

Great for simple alarms

Integrated this into a basic intruder alert system. The 7-meter range covers my living room perfectly. No false alarms so far after two weeks of testing.

Anonymous

Mar 17, 2026

Rating: 5/5

Excellent for learning electronics

Bought this for a university project. The documentation online is plentiful, and the module itself is robust. It detected motion instantly during our demo.

Anonymous

Mar 16, 2026

Rating: 5/5

Perfect for Arduino projects

This sensor works flawlessly with my Arduino Uno. The detection range is accurate, and the sensitivity adjustments are very responsive. Great value for money.

Anonymous

Mar 10, 2026

Rating: 5/5

Reliable and compact

Small form factor makes it easy to hide in enclosures. The voltage range is wide enough to run directly off a 9V battery or a 5V USB supply.

Anonymous

Mar 02, 2026

Rating: 4/5

Good sensitivity, needs calibration

Works well for my hallway light automation. Had to tweak the delay potentiometer a few times to get the timing just right, but once set, it's reliable.

5 FAQ

Q: Does this module come with a lens cover?

A: Yes, it comes with a standard white Fresnel lens dome pre-installed. This lens focuses the infrared signals onto the sensor element.

Q: What is the difference between L and H trigger modes?

A: In H mode (repeatable trigger), the output stays high as long as motion is detected. In L mode (non-repeatable), the output goes high once and waits for the delay time to finish before sensing again.

Q: Can this sensor detect motion through glass?

A: No, PIR sensors cannot detect infrared radiation through glass as glass blocks IR waves. The sensor needs a direct line of sight or an open window.

Q: How do I adjust the detection distance?

A: There is a potentiometer labeled 'Distance' on the board. Turn it clockwise to increase sensitivity and range, or counter-clockwise to decrease it.

Q: Is it compatible with Raspberry Pi GPIO pins?

A: Yes, it is compatible. Since the output is 3.3V high, it can be connected directly to a Raspberry Pi GPIO input pin without needing a level shifter.

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