Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	HC-SR501
Operating Voltage	DC 4.5V - 20V
Detection Angle	< 120 degrees cone angle
Detection Distance	3 to 7 meters (adjustable)
Trigger Mode	L (Low) and H (High) selectable via jumper
Delay Time	5s to 300s (adjustable potentiometer)
Blocking Time	2.5s (default, adjustable)
Output Signal	3.3V High level / 0V Low level
Dimensions	32mm x 24mm
Operating Temperature	-15°C to +70°C

6 reviews

Anonymous

Mar 27, 2026

Rating: 4/5

Good sensitivity, needs calibration

The module is sensitive and picks up motion well. I had to tweak the potentiometers a bit to stop false triggers from my ceiling fan, but once set, it works great.

Anonymous

Mar 25, 2026

Rating: 5/5

Excellent for learning electronics

Bought this for a university project on smart lighting. The documentation online is plentiful, and the module itself is robust. Highly recommended for beginners.

Anonymous

Mar 22, 2026

Rating: 5/5

Best PIR sensor in this price range

I have tried several brands, and this HC-SR501 offers the best stability. The warm-up time is reasonable, and the output signal is clean for microcontrollers.

Anonymous

Mar 18, 2026

Rating: 4/5

Solid performance

Works as advertised. The L/H trigger mode selection is a nice feature that adds flexibility. Only giving 4 stars because the pins were slightly bent upon arrival, but easily fixed.

Anonymous

Mar 17, 2026

Rating: 5/5

Perfect for Arduino projects

This sensor works flawlessly with my Arduino Uno. The detection range is accurate, and the delay time adjustment is very smooth. Great value for money.

Anonymous

Mar 06, 2026

Rating: 5/5

Reliable and compact

Small footprint makes it easy to hide in enclosures. I've used three of these for different rooms, and they all perform consistently. No issues so far.

5 FAQ

Q: Does this come with headers pre-soldered?

A: Typically, these modules are shipped with unsoldered pins to allow for flexible mounting options. You will need to solder the 3-pin header yourself.

Q: Is this compatible with Raspberry Pi GPIO?

A: Yes, it is compatible. Since the output is 3.3V high, it connects directly to Raspberry Pi GPIO pins without needing a level shifter. Just ensure you connect VCC to 5V and GND to Ground.

Q: Can this sensor detect motion through glass?

A: No, standard PIR sensors like the HC-SR501 cannot detect infrared radiation through glass. It requires 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 the range and counter-clockwise to decrease it. Test in your specific environment for best results.

Q: What is the maximum current this module can handle?

A: The output pin is designed for logic signals (approx. 3.3V) and should not be used to drive high-current loads directly. Please use a relay or transistor to control devices like lamps or motors.

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