Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | DC 4.5V - 20V |
| Detection Distance | 3 to 7 meters (adjustable) |
| Detection Angle | < 120 degrees cone angle |
| Trigger Mode | L (Non-repeatable) / H (Repeatable) jumper selectable |
| Delay Time | 5s to 300s (adjustable via potentiometer) |
| Block Time | 2.5 seconds (default, adjustable) |
| PCB Dimensions | 32mm x 24mm |
| Lens Type | Fresnel Lens included |
| Working Temperature | -15°C to +70°C |
| Output Signal | High level 3.3V / Low level 0V |
Anonymous
Mar 27, 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 make it easy to fine-tune sensitivity and delay time. Great value for money.
Anonymous
Mar 24, 2026
Rating: 5/5
Reliable and cheap
Bought five of these for a university robotics project. All of them worked out of the box. The documentation online is plentiful, making integration very straightforward.
Anonymous
Mar 22, 2026
Rating: 4/5
Good sensitivity, needs calibration
Works well for my automatic hallway light project. Initially, it was too sensitive to heat changes, but after adjusting the potentiometer, it performs exactly as needed.
Anonymous
Mar 21, 2026
Rating: 5/5
Fast shipping, great product
Arrived quickly and was well packaged. Tested immediately upon arrival and the LED indicator responded instantly to motion. Highly recommended for hobbyists.
Anonymous
Mar 14, 2026
Rating: 4/5
Solid component
Standard HC-SR501 module. Nothing fancy, but it does the job perfectly. Just ensure you provide a stable 5V power supply to avoid false triggers.
Anonymous
Mar 07, 2026
Rating: 5/5
Excellent motion detector
I use this to trigger a camera trap in my garden. It ignores small animals but picks up human movement reliably. The repeatable trigger mode is a great feature.
Q: Is this sensor waterproof for outdoor use?
A: No, the PCB and components are not waterproof. If used outdoors, you must house the module in a weatherproof enclosure with a clear window for the IR signal.
Q: Can I adjust the detection distance?
A: Yes, there is a potentiometer labeled 'Distance' on the board. Turning it clockwise generally increases the detection range, while counter-clockwise decreases it.
Q: What is the difference between L and H trigger modes?
A: In 'H' (Repeatable) mode, the output remains high as long as motion is detected. In 'L' (Non-repeatable) mode, once triggered, the output goes high for the set delay time and will not re-trigger until the block time has passed, even if motion continues.
Q: Can this sensor work directly with a 3.3V microcontroller like ESP8266?
A: Yes, the output high level is 3.3V, so it is compatible with 3.3V logic systems. However, ensure the input voltage to the module itself is within the 4.5V-20V range for stable operation, or use a dedicated 3.3V version if available.
Q: Does this come with the Fresnel lens attached?
A: Yes, the white dome-shaped Fresnel lens comes pre-installed on the module to focus infrared radiation onto the sensor element.
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