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Home / Sensors / HC-SR501 Human Body Infrared Sensing Module Pyroelectric Infrared Sensor

Attributes

Brand -
Category Robotics / STEM Teaching Tools / Sensors
Origin -
Operating Voltage DC 4.5V - 20V
Detection Distance Up to 7 meters
Detection Angle < 100 degrees cone angle
Trigger Mode Jumper selectable (H/L)
Output Signal High level 3.3V / Low level 0V
Delay Time Adjustable from 5s to 300s
Blockade Time Fixed at 2.5 seconds
PCB Dimensions 32mm x 24mm
Lens Type Fresnel Lens included
Working Temperature -15°C to +70°C

6 reviews

A

Anonymous

Mar 30, 2026

Rating: 4/5

Great hardware, watch the voltage

Works great, but remember it outputs 3.3V logic. If you are using a 5V microcontroller without level shifting, ensure your board is 5V tolerant on the input pin. Otherwise, perfect sensor.

A

Anonymous

Mar 30, 2026

Rating: 5/5

Reliable and robust

I've been using this in an outdoor security light prototype (housed in a waterproof case). It has survived rain and heat without issues. The delay timer is very useful for keeping lights on.

A

Anonymous

Mar 17, 2026

Rating: 4/5

Good sensitivity, needs calibration

The module detects motion reliably once you spend a minute adjusting the two potentiometers. Initially, it was too sensitive to temperature changes, but after tuning, it only triggers on actual movement.

A

Anonymous

Mar 17, 2026

Rating: 5/5

Essential for robotics class

Bought five of these for our university robotics project. They are compact, easy to wire, and the documentation online is plentiful. Highly recommended for beginners.

A

Anonymous

Mar 17, 2026

Rating: 5/5

Exceeded expectations

Very responsive. I use it to automatically turn on my desk lamp when I sit down. The blockade time prevents it from flickering off while I am still moving slightly. Excellent product.

A

Anonymous

Mar 03, 2026

Rating: 5/5

Perfect for Arduino Projects

This sensor works flawlessly with my Arduino Uno. The detection range is accurate, and the sensitivity potentiometer makes it easy to fine-tune for specific room sizes. Great value for the price.

5 FAQ

Q: Is this compatible with Raspberry Pi GPIO pins?

A: Yes, it is fully compatible. Since the output is 3.3V, it connects directly to the Raspberry Pi GPIO without needing a level shifter.

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: Does this come with headers pre-soldered?

A: No, the module typically comes with unsoldered pins to allow for flexible mounting options. You will need to solder the 3-pin header yourself.

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

A: In H mode (High), the output stays high as long as motion is continuously detected. In L mode (Low), the output goes high for the set delay time once motion is detected, regardless of continued movement.

Q: Can this sensor detect motion through glass?

A: No, standard PIR sensors cannot detect infrared radiation through glass. The lens must have a direct line of sight to the subject.

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