Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | DC 4.5V - 20V |
| Detection Distance | Up to 7 meters |
| Detection Angle | < 120 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 |
| Lens Type | Fresnel Lens included |
| Output Signal | 3.3V TTL High / Low level |
| Working Temperature | -15°C to +70°C |
Anonymous
Mar 24, 2026
Rating: 5/5
Perfect for Arduino Projects
This sensor works flawlessly with my Arduino Uno. The detection range is accurate, and the adjustment pots for time and sensitivity are very responsive. Great value for hobbyists.
Anonymous
Mar 10, 2026
Rating: 5/5
Reliable and cheap
We bought ten of these for our makerspace kits. They have held up well under constant student use. The voltage range is flexible enough for both 5V and 12V systems.
Anonymous
Mar 09, 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. The L/H trigger jumper is a nice feature for different use cases.
Anonymous
Mar 09, 2026
Rating: 4/5
Works as described
Solid little sensor. The delay time adjustment is quite wide, which is helpful. Only giving 4 stars because the pins were slightly bent upon arrival, but easy to fix.
Anonymous
Mar 02, 2026
Rating: 5/5
Great for intrusion alarms
Integrated this into a custom Raspberry Pi security system. The output signal is clean and easy to read. Detection angle covers my entire doorway perfectly.
Anonymous
Mar 01, 2026
Rating: 4/5
Good sensitivity, needs calibration
The module detects motion well, but I had to spend some time tweaking the sensitivity knob to avoid false triggers from my ceiling fan. Once calibrated, it works great for my hallway light project.
Q: What is the difference between L and H trigger modes?
A: In 'H' mode, the output stays high as long as motion is detected and resets after the delay once motion stops. In 'L' mode, the output goes high upon detection and remains high for the set delay time regardless of continued motion.
Q: Is the output compatible with 5V microcontrollers like Arduino?
A: Yes, the output is 3.3V TTL, which is recognized as a HIGH signal by most 5V microcontrollers including Arduino, ESP8266, and ESP32.
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. Test adjustments in small increments.
Q: Does this module work outdoors?
A: While the electronics function outdoors, the module is not weatherproof. You must house it in a waterproof enclosure if used outside, and ensure the lens is protected from rain and direct sunlight.
Q: Can this sensor be powered directly by a 9V battery?
A: Yes, the HC-SR501 operates on a DC voltage range of 4.5V to 20V, so a standard 9V battery is perfectly suitable.
Premium Thick Cardstock Lin Zexu Representative Small Regular Script Infinite Life Sutra Close-Up Copying Calligraphy Copybook Regular Script for Beginners
$39.80
Zunjue Ticket-style 100% Cotton Watercolor Paper 300g Cold Press for Artists with Deckled Edges
$10.20
Kids' 3D Printing Pen – 3D Stereoscopic Drawing Toy for Girls, Perfect Birthday Gift
$104.66
Mifaner Handmade Watercolor Sketchbook – Oil Painting Series Canvas Journal, Travel-Friendly Mini Notebook for Acrylic Markers
$16.90
(Sasha Exclusive) Fat Small Card
$1,399.00
Silicone Faucet Side Drain Mat, Foldable Splash-Proof Pad for Kitchen Sink and Bathroom Washbasin
$4.93
Breathable Portable Invisible Aligner Case with Lanyard – Durable Hygienic Storage for Orthodontic Retainers and Dentures
$18.10
Snail-Specific Slug & Snail Killer Scatter-Type Anti-Pest Granules for Vegetable Gardens Slugs Apple Snails Fruit & Vegetable Fields
$10.00
Industrial Scouring Pad for Woodworking, Paint Sanding, and Polishing - Ultra-Fine Hand-Tear Sheets
$135.70
Custom G80 Manganese Steel Lifting Chain - High-Strength Alloy Chain Rigging for Hoisting and Cranes
$655.00
High-Concentration Oxygen Generator for Aquaculture with High-Pressure Outlet, Ceramic Nano Disc, and Oxygen Dissolution Cone
$50.00
Paint Brush Rinser – Art Supply Cleaning Cup for Brushes, Palettes, and Pigment Washing
$21.80
Heidelberg Printing Press Paper Pressure Wheel Screen Printing Roller Felt Wheel Guanghua Beiren Paper Feed Wheel Laminating Machine Brush Wheel
$6.00
Baofeifan Bubble Squeeze Painting Kit for Kids - Foaming Textured Paper, Wood Pulp Cotton DIY 3D Art with Markers
$10.00
Westwood Portable Retainer Case for Elderly Dentures and Children's Orthodontic Correctors, Storage Box
$14.20
PELICAN 1510 Protective Safety Case with Trolley - Waterproof Travel Box for Outdoor Photography Gear
$1,360.00
![Haisen [Exclusive Purchase Link] Livestream Link for New Arrivals and Clearance - Incense Sticks, Coil Incense, Agarwood, Sandalwood, Powder, Burners](https://www.gosteppe.com/cache/small/product/268968/legacy-main-4bd453bbd9b19100c4fd925a.webp)
Haisen [Exclusive Purchase Link] Livestream Link for New Arrivals and Clearance - Incense Sticks, Coil Incense, Agarwood, Sandalwood, Powder, Burners
$13.80
Ultralight Silicone-Coated Waterproof Dry Bag for Outdoor River Trekking, Rafting, Swimming, Beach Use – Wet/Dry Separation Storage for Swimwear and Towels
$38.20
Food Warmer Cabinet, Room Temperature Commercial Constant-Temperature Display Case, Egg Tart Heating Cabinet, Small Countertop Sample Retention Cabinet, Chestnut, White
$239.00
Ultra-Narrow 8/9/10cm Bathroom and Kitchen Gap Storage Rack with Wheels
$15.90
Glow-in-the-Dark 3D Printing Pen for Kids, Low-Temperature Stereoscopic Graffiti Magic Pen, Drawing Toy, Birthday Gift for Girls
$21.80
Custom Insulated Steel Pipes from Factory - Heating Pipes for Residential Complexes, Spiral Insulated Pipes, Polyurethane Insulated Pipes
$45.40
New Pirelli Tires 305/40R20 112V & 275/45R20 110V XL N1 for Porsche Cayenne
$1,409.00
Over-Toilet Storage Rack Wall-Mounted No-Drill Bathroom Multi-Function Organizer for Toilet Essentials
$20.50
Kang Kati Gardenia Tea Scented Candle Gift Set – Long-Lasting Fragrance, Elegant Birthday Gift for Her
$35.10
Safety Self-Locking Lifting Hook with Adjustable Chain for Hoisting and Rigging
$140.00
Thickened Mobile Phone Waterproof Case, Waterproof Box, Sealed Container, Pressure-Resistant Box, EDC Drop-Proof Storage Box for Outdoor Travel
$12.00
Commercial Heated Display Cabinet for Crispy Pork Belly, Roast Chicken, and Cantonese BBQ - Constant Temperature Warmer for Peking Duck
$1,394.00
Mejiang Baohong Watercolor Line Art for Beginners, Coloring Book with Colored Pencils and Markers, Cat Letter Theme
$29.70
Shanghai Huamei Hair Transplant, Solution for Hair Loss, Thinning, and Density Enhancement
$6,750.00
![[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set](https://www.gosteppe.com/cache/medium/product/208273/legacy-main-9ec245ebf781f65a434ba854.webp)
