A
Anonymous
Mar 24, 2026
Rating: 5/5
Reliable detection
I have used these in multiple alarm prototypes. They are consistent and stable.
Description
HC-SR501 Human Body Infrared Induction Module Sensor Pyroelectric Probe Electronic Module
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Operating Voltage | DC 4.5V - 20V |
| Quiescent Current | < 50uA |
| Detection Distance | 3 to 7 meters (adjustable) |
| Detection Angle | < 100 degrees cone angle |
| Output Signal | 3.3V TTL Level (High/Low) |
| Delay Time | 5 to 200 seconds (adjustable) |
| Blockade Time | 2.5 seconds (default) |
| PCB Dimensions | 32mm x 24mm |
| Mounting Hole Diameter | 4mm |
| Operating Temperature | -15°C to +70°C |
5 reviews
A
Anonymous
Mar 19, 2026
Rating: 5/5
Perfect for beginner projects
This sensor worked immediately with my Arduino Uno. The potentiometers make it easy to adjust sensitivity and time.
A
Anonymous
Feb 28, 2026
Rating: 5/5
Easy to wire
Clear pin labels for VCC, OUT, and GND. No confusion during setup.
A
Anonymous
Feb 24, 2026
Rating: 4/5
Solid component
Bought a batch for our workshop. Most worked perfectly, one needed sensitivity tuning.
A
Anonymous
Jan 27, 2026
Rating: 4/5
Good value for money
Works well for hallway lighting. The blockade time is fixed but acceptable for most uses.
5 FAQ
Q: Can this sensor be used outdoors?
A: The module itself is not waterproof. You must use a waterproof enclosure for outdoor installation.
Q: Is this compatible with Raspberry Pi GPIO?
A: Yes, the output is 3.3V TTL which is safe for Raspberry Pi GPIO pins.
Q: What are the trigger modes available?
A: It supports single trigger and repeatable trigger, selectable via a jumper cap on the PCB.
Q: How do I change the detection range?
A: Use the 'S' potentiometer on the board. Turn clockwise to increase distance.
Q: Does it detect motion through glass?
A: PIR sensors generally cannot detect infrared heat signatures through glass effectively.
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