Skip to main content
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.

Explore your interests

View More
All Categories
Best Seller (30)
New List (30)
Youzhao Pai Creative Retro 3D Embossed House Number Plate – Custom Door Signs for Villas, Commercial Spaces, and Homes

Youzhao Pai Creative Retro 3D Embossed House Number Plate – Custom Door Signs for Villas, Commercial Spaces, and Homes

$200.00

Tianzheng DZ15LE-100/3N901T 100A Transparent Leakage Circuit Breaker, Molded Case Circuit Breaker 3901T 63A

Tianzheng DZ15LE-100/3N901T 100A Transparent Leakage Circuit Breaker, Molded Case Circuit Breaker 3901T 63A

$278.00

[Daimai Holds Micro-Needle Hair Transplant Patent] Little Red Cap Hydro Glow | Scalp Hydration and Repair

[Daimai Holds Micro-Needle Hair Transplant Patent] Little Red Cap Hydro Glow | Scalp Hydration and Repair

$880.00

Pelican Rolling Case pelican1560 - Waterproof Shockproof Safety Case for Photography Equipment and Instruments

Pelican Rolling Case pelican1560 - Waterproof Shockproof Safety Case for Photography Equipment and Instruments

$1,550.00

Disipulai Hot Air Circulation Vertical Food Warmer Display Cabinet - Adjustable Temperature Countertop Cooked Food Warming Equipment

Disipulai Hot Air Circulation Vertical Food Warmer Display Cabinet - Adjustable Temperature Countertop Cooked Food Warming Equipment

$2,023.00

Complete Pasteurization Production Line for Pomegranate, Grape, Orange, Apple Juice, and Mare's Milk

Complete Pasteurization Production Line for Pomegranate, Grape, Orange, Apple Juice, and Mare's Milk

$6,048.00

Portable Tire Stone Removal Tool - Essential Handheld Hook for Car Owners

Portable Tire Stone Removal Tool - Essential Handheld Hook for Car Owners

$13.73

Factory Direct Longan 160 Curved Hot Stamping Machine Fully Automatic Hot Foil Printer Pneumatic Heat Press Leather Embossing Machine

Factory Direct Longan 160 Curved Hot Stamping Machine Fully Automatic Hot Foil Printer Pneumatic Heat Press Leather Embossing Machine

$10,000.00

Bean Sprout Germinator Tray, Hydroponic Vegetable Growing Container, Soil-Free Pea Sprouting Pot

Bean Sprout Germinator Tray, Hydroponic Vegetable Growing Container, Soil-Free Pea Sprouting Pot

$14.06

TOPTOY Crayon Shin-chan Memory Echo Series Blind Box - Anime Figure Collectible Toy and Birthday Gift

TOPTOY Crayon Shin-chan Memory Echo Series Blind Box - Anime Figure Collectible Toy and Birthday Gift

$47.20

Natural Lightning Cat's Eye Yellow Tiger Eye Loose Beads, Single Crystal Beads for DIY Bracelets and Accessories

Natural Lightning Cat's Eye Yellow Tiger Eye Loose Beads, Single Crystal Beads for DIY Bracelets and Accessories

$3.91

Pirelli Tire 235/55R19, Original Equipment for Mercedes-Benz GLC, Genuine Tire Compatible with Audi/Land Rover/etc.

Pirelli Tire 235/55R19, Original Equipment for Mercedes-Benz GLC, Genuine Tire Compatible with Audi/Land Rover/etc.

$512.00

Biliansheng Hair Transplant: No-Shave Hairline Restoration, Top Thinning Density Enhancement, Nationwide Chain

Biliansheng Hair Transplant: No-Shave Hairline Restoration, Top Thinning Density Enhancement, Nationwide Chain

$9,999.00

Luru Authentic 15-Note Steel Tongue Drum - Professional Grade for Beginners, Adults, and Children

Luru Authentic 15-Note Steel Tongue Drum - Professional Grade for Beginners, Adults, and Children

$500.00

MOOCAT [Postage Stamp Stub] Hand-Drawn Blank Irregular Wood Pulp Fine-Texture Paper for Cyanotype, OC Signing, and Collage

MOOCAT [Postage Stamp Stub] Hand-Drawn Blank Irregular Wood Pulp Fine-Texture Paper for Cyanotype, OC Signing, and Collage

$9.90

Used Car Tires - Sizes 155/165/175/185/195/205/215 for 13/14/15/16 inch Rims

Used Car Tires - Sizes 155/165/175/185/195/205/215 for 13/14/15/16 inch Rims

$140.00

Pin Puller Extractor Mechanical Repair Tool Bearing Puller and Locating Pin Extractor

Pin Puller Extractor Mechanical Repair Tool Bearing Puller and Locating Pin Extractor

$76.50

Water Brush Pen Set with Large Capacity - Essential Tools for Beginners Using Gouache, Solid Watercolor Paints, and Line Drawing; Perfect for Art Students

Water Brush Pen Set with Large Capacity - Essential Tools for Beginners Using Gouache, Solid Watercolor Paints, and Line Drawing; Perfect for Art Students

$32.00

C9335 Automotive Brake Disc Lathe – Resurfacing, Boring, Grinding & Polishing Machine

C9335 Automotive Brake Disc Lathe – Resurfacing, Boring, Grinding & Polishing Machine

$16,005.00

Jaguar Tire Lug Nuts Compatible with XE/XF/XJL/F-TYPE/F-PACE - Wheel Hub Screw Caps for Modification

Jaguar Tire Lug Nuts Compatible with XE/XF/XJL/F-TYPE/F-PACE - Wheel Hub Screw Caps for Modification

$118.00

Three-Hook Tire Stone Removal Tool, Wheel Groove Cleaner for Removing Stones from Vehicle Tires

Three-Hook Tire Stone Removal Tool, Wheel Groove Cleaner for Removing Stones from Vehicle Tires

$4.80

Pad Printer Accessories: 4-Inch Blade Clamp, Blade Holder, and Doctor Blade Assembly

Pad Printer Accessories: 4-Inch Blade Clamp, Blade Holder, and Doctor Blade Assembly

$5.40

3M Industrial Scouring Pad 7447C, Metal Rust Removal, Stainless Steel Brushing and Polishing Cloth

3M Industrial Scouring Pad 7447C, Metal Rust Removal, Stainless Steel Brushing and Polishing Cloth

$4.00

Qinghe Blazing Rose Series

Qinghe Blazing Rose Series

$1,580.00

Cheddar Cheese Production Line, Front-End Processing and Deep Processing Machinery, Mozzarella Cheese Equipment

Cheddar Cheese Production Line, Front-End Processing and Deep Processing Machinery, Mozzarella Cheese Equipment

$25,480.00

MGQ Konjac Noodle Bubble Cleaning Machine, Fully Automatic Soaking and Lifting Washer

MGQ Konjac Noodle Bubble Cleaning Machine, Fully Automatic Soaking and Lifting Washer

$17,555.40

Industrial Large Meat Grinder Fresh Meat Mince Chopper Fruit Vegetable Crusher Meat Grinding and Mixing Integrated Meat Filling Mixer

Industrial Large Meat Grinder Fresh Meat Mince Chopper Fruit Vegetable Crusher Meat Grinding and Mixing Integrated Meat Filling Mixer

$32,030.00

Zhuolide D-302 UV Glue - Invisible Adhesive for Transparent Glass, Metal, Coffee Tables, and Crystal Glass, 250g Large Capacity

Zhuolide D-302 UV Glue - Invisible Adhesive for Transparent Glass, Metal, Coffee Tables, and Crystal Glass, 250g Large Capacity

$130.00

Hell Training Rock Guitar by Shinichi Kobayashi: Electric Guitar Tutorial for Speed Playing

Hell Training Rock Guitar by Shinichi Kobayashi: Electric Guitar Tutorial for Speed Playing

$106.00

[Buy One Get One Free] Natural Agarwood, Sandalwood, and Cypress Incense Powder Set with Electric Burner

[Buy One Get One Free] Natural Agarwood, Sandalwood, and Cypress Incense Powder Set with Electric Burner

$8.42