HC-SR501 Adjust IR Pyroelectric Infrared PIR Motion Sensor Detector Module Fit for Arduino for Raspberry Pi Kits + Case(HC-SR501 Green)
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“Solid budget motion sensor for indoor prototyping; acceptable performance-per-dollar but infrared interference limitations prevent recommendation for temperature-sensitive or outdoor deployments.”
Our Review
The HC-SR501 delivers reliable motion detection for hobbyist projects at an unbeatable price point. The dual potentiometers for sensitivity and delay adjustment are genuinely useful—I appreciated the ~3-12m detection range flexibility and 0.3-25 second retrigger timing. Output signal is clean and integrates seamlessly with Arduino/Pi GPIO inputs. However, the green PCB variant shows occasional false triggers in direct sunlight or near heat sources, and the included case feels flimsy. Initial warm-up period (~60 seconds) requires patience in time-critical applications.
What We Like
- Adjustable sensitivity and delay potentiometers cover real-world use cases effectively
- Low power consumption (~65mA) suitable for battery-operated projects
- Reliable 3.3V/5V compatibility with clear pinout documentation
Watch Out For
- Susceptible to false positives from direct sunlight and thermal interference
- Cheap plastic case doesn't protect against accidental solder splashes or moisture
- Requires extended warm-up period before stable operation
The Verdict
“Solid budget motion sensor for indoor prototyping; acceptable performance-per-dollar but infrared interference limitations prevent recommendation for temperature-sensitive or outdoor deployments.”
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