Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | HC-SR501 |
| Working Voltage | DC 4.5V - 20V |
| Detection Distance | 3 to 7 meters (adjustable) |
| Detection Angle | < 100 degrees cone angle |
| Trigger Mode | L (repeatable) / H (non-repeatable) |
| Output Signal | High level 3.3V / Low level 0V |
| Delay Time | 5s to 300s (adjustable) |
| Blockade Time | 2.5 seconds (default) |
| PCB Dimensions | 32mm x 24mm |
| Operating Temperature | -15°C to +70°C |
Anonymous
Mar 27, 2026
Rating: 5/5
Stable and responsive
I've used these in several robotics applications. The response time is quick, and the output signal is clean. Highly recommend for anyone building automatic door openers or security alarms.
Anonymous
Mar 18, 2026
Rating: 5/5
Perfect for Arduino projects
This sensor works flawlessly with my Arduino Uno. The sensitivity adjustment potentiometer makes it easy to fine-tune the detection range for my hallway light project. Very reliable.
Anonymous
Mar 15, 2026
Rating: 5/5
Bulk buy quality
Purchased ten of these for our workshop. All units tested functional out of the box. Consistent performance across the batch. Excellent component for teaching IoT basics.
Anonymous
Mar 15, 2026
Rating: 4/5
Works as described
As a beginner, I found this module very forgiving. The pins are clearly labeled. My only minor complaint is that the delay time dial is quite sensitive, so small turns make big changes.
Anonymous
Mar 07, 2026
Rating: 4/5
Good value but needs calibration
Great little module for the price. It took a minute to understand the jumper settings for trigger modes, but once configured, it detects motion accurately. Just give it a warm-up time after powering on.
Anonymous
Mar 03, 2026
Rating: 5/5
Easy to integrate
Connected this to a Raspberry Pi GPIO pin without any issues. The documentation online is plentiful, making setup straightforward. It handles false triggers from pets well when adjusted correctly.
Q: Why does the LED stay on constantly after power up?
A: The sensor requires an initial warm-up period of about 30 to 60 seconds after being powered on to calibrate. During this time, the LED may behave erratically or stay on. Wait a minute before testing.
Q: Can this sensor detect motion through glass?
A: No, PIR sensors generally cannot detect infrared radiation through glass effectively as glass blocks IR waves. It is best used with a clear line of sight.
Q: What is the difference between L and H trigger modes?
A: In 'L' mode (repeatable), the output stays high as long as motion is detected. In 'H' mode (non-repeatable), the output goes high upon detection and stays high for the set delay time regardless of continued motion.
Q: Does this module come with a lens cover?
A: Yes, the module typically comes with a white, dome-shaped Fresnel lens cover pre-installed to focus the infrared signals onto the sensor.
Q: Is 5V input safe for this module?
A: Yes, the HC-SR501 operates safely within the DC 4.5V to 20V range, so a standard 5V power supply from a USB source or microcontroller is perfectly suitable.
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