HiLetgo 3pcs HC-SR501 PIR Infrared Sensor Human Body Infrared Motion Module
Quick take
The HiLetgo HC-SR501 PIR motion sensor modules are meant for DIY motion detection, typically with Arduino or Raspberry Pi, where you want motion events to trigger a relay, LED driver, buzzer, or other electronics. Buyers report the modules can be straightforward to tune once you understand the delay and sensitivity controls, but documentation can be unclear and power voltage is something to take seriously.
Pros and cons
Pros
- Adjustable delay time (5 to 200 seconds range) and sensitivity controls for tailoring behavior.
- Supports different trigger modes (non-repeat vs repeat) via the on-board jumper.
- Low quiescent current (<50 uA) and wide operating voltage range (DC 4.5 to 20 V).
- Good project-friendly size (board about 32 mm by 24 mm) and included 3-pack value.
Cons
- Setup and timing expectations can be harder than expected due to documentation ambiguity.
- Behavior can become erratic if input voltage is too low, so using the right power supply matters.
- Review evidence is mixed on consistency (a buyer reported one module not working), so consider buying a small buffer if you need perfection.
What buyers think
Buyer-review evidence for these PIR modules points to two main themes: performance once configured and learning curve during setup. Several buyers say the sensors work as expected for motion-triggered control, with delay timing that matches the general adjustable behavior described for the HC-SR501 family. The on-board controls for time delay and sensitivity are highlighted as useful for tuning how long the output stays active and how easily motion is detected. On the downside, documentation clarity appears to vary, with some buyers noting confusion about delay timing interpretation. Power voltage also comes up, because a low-voltage supply can lead to unstable output behavior.
How this PIR module is typically used
This is a PIR (passive infrared) human-body motion sensor module designed to feed an output signal to a microcontroller or simple switching circuit. Common DIY use cases include motion-activated lighting (night lights, closet or corridor lights), motion-triggered alarms or buzzers, and event-based control for fans or small appliances.
Because it includes adjustment controls and a trigger-mode jumper, the module can be configured as either a momentary digital-style event or a longer “stays active” style output while motion persists (depending on the trigger setting you choose).
Key specs that matter for buying
Power and signal behavior
- Operating voltage range: DC 4.5 to 20 V.
- Quiescent current: under 50 uA, which helps for low-power standby use.
- Trigger modes: supports non-repeat trigger and repeat trigger (selectable via the jumper).
Timing and sensitivity adjustments
- Delay time: adjustable, with an overall range listed as 5 to 200 seconds.
- Timing block time: listed as 2.5 seconds default, with a configurable range for blocked behavior.
- Sensitivity and detection distance: the board includes tuning for sensitivity, and buyers mention the ability to adjust detection to reduce unwanted triggers.
Coverage and optics
- Angle sensor: listed as under 100° cone angle.
- Lens size: sensor lens diameter listed as 23 mm (default).
- Maximum range: listed as about 2 meters (typical for how PIR modules are spec’d, but real-world results depend on placement and environment).
Size and mounting
The board is compact (about 32 mm by 24 mm), making it practical for small enclosures. Mounting is described as wall mount, and the lens area is designed to be positioned toward the monitored area.
Pros and cons, in practical terms
When this is a strong fit
- You want a DIY motion module: If you’re building an Arduino or Raspberry Pi project that needs a motion input, this form factor is commonly used for that purpose.
- You need adjustable behavior: The ability to tune delay and sensitivity helps when you want shorter triggers, fewer false activations, or longer “on” times for lighting.
- You’re comfortable with electronics setup: Proper power selection and wiring are important for stable results.
When you might want to look elsewhere
- You want plug-and-play: If you’re expecting fully documented, instant results with no tuning, the learning curve may be a hurdle.
- Your project power supply is uncertain: Reviews suggest unstable operation if the input voltage dips too low.
- You need maximum consistency across every unit: With a 3-pack, occasional DOA risk exists, so if failure would stop your build, it may be worth planning a backup.
Verdict: is it worth it?
The HiLetgo 3pcs HC-SR501 PIR motion sensor modules are a solid value if your goal is to build or customize motion-activated electronics and you are willing to tune the timing and sensitivity. The biggest buying caveats are setup clarity and power stability, so pairing it with a properly sized DC supply and taking time to dial in the controls should make a noticeable difference. If you want a motion trigger with adjustable delay, this is the type of sensor that typically delivers, once configured.
Alternatives to consider (based on your priorities)
- If you need more predictable “out of the box” behavior: consider a PIR sensor designed as a finished module with clearer documentation and fixed timing for your specific application.
- If you need longer range or wider coverage: look for PIR sensors with documented coverage beyond a couple meters, and check how sensitivity is tuned in real conditions.
- If you want lower false triggers: search for options that add better shielding, improved lens design, or provide clearer guidance for placement and sensitivity settings.
FAQs
Note: The answers below focus on the buying and setup decisions that commonly come up with HC-SR501-style PIR modules.
What microcontrollers work with this PIR sensor module?
It is intended for use with platforms like Arduino and Raspberry Pi, and can be wired so its output signal can drive digital inputs or switching circuits for motion-triggered projects.
How do the delay time and trigger modes work?
The module includes an adjustable delay time (listed range 5 to 200 seconds). It also supports a jumper-based selection between non-repeat and repeat trigger behavior, which affects whether the output acts like a discrete event or stays active as motion persists.
What power supply should I use?
The operating voltage range is listed as DC 4.5 to 20 V. Using a stable supply within that range matters, because reports indicate erratic output behavior when the input voltage is too low.
What detection distance and coverage should I expect?
Specs list maximum range around 2 meters and an angle sensor under 100° cone angle. Real-world detection depends on how you mount it, the environment, and how you tune sensitivity.
Is the 3-pack better than buying one sensor?
A 3-pack can be useful if you’re building multiple zones, experimenting with placement, or want backups in case one unit fails during a build. If your project has no tolerance for failures, plan for that by having spares or testing early.
Specifications
| Product Title | HiLetgo 3pcs HC-SR501 PIR Infrared Sensor Human Body Infrared Motion Module for Arduino Raspberry Pi |
|---|---|
| Category | Electronics > Security & Surveillance > Motion Detectors |
| Brand | HiLetgo |
| Manufacturer | HiLetgo |
| Model Number | 3-01-0120 |
| Color | Black, Green, White, Yellow |
| Item Weight | 0.81 Ounces |
| Power Source | DC Power Supply |
| Maximum Range | 2 Meters |
| Mounting Type | Wall Mount |
| Battery Description | Battery not included |
| Compatible Devices | Arduino, Raspberry Pi |
| Operating Temperature | 50 Degrees Celsius |
| Antenna Location | Sidewalk, Driveway |
| Mfr Part Number | 3-01-0120 |
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