Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | HC-SR501 |
| Operating Voltage | DC 4.5V - 20V |
| Detection Distance | 3 to 7 meters (adjustable) |
| Detection Angle | < 120 degrees cone angle |
| Trigger Mode | L (Low) and H (High) selectable via jumper |
| Delay Time | 5s to 300s (adjustable potentiometer) |
| Blocking Time | 2.5 seconds (default, adjustable) |
| Output Signal | 3.3V High level / 0V Low level |
| Dimensions | 32mm x 24mm |
| Operating Temperature | -15°C to +70°C |
Anonymous
Mar 22, 2026
Rating: 4/5
Good sensor, read the datasheet
Works well once you understand the jumper settings for L and H trigger modes. Initially, I thought it was faulty because the delay wasn't working as expected, but I had the jumper on the wrong setting. Once fixed, it's very reliable.
Anonymous
Mar 20, 2026
Rating: 5/5
Bought 10 for student kits
Purchased a bulk pack for our high school robotics club. All units tested functional out of the box. Students found them easy to integrate into their final projects. Highly recommended for educational use.
Anonymous
Mar 17, 2026
Rating: 5/5
Perfect for Arduino Projects
This sensor works flawlessly with my Arduino Uno. The sensitivity adjustment is very responsive, and I was able to set the detection range exactly how I needed for my hallway light project. Great value for the price.
Anonymous
Mar 14, 2026
Rating: 5/5
Low power consumption
Running this on a battery-powered ESP32 setup. The current draw in standby is minimal, making it ideal for wireless security applications. Detection is instant and accurate.
Anonymous
Mar 01, 2026
Rating: 5/5
Reliable motion detection
Using this to trigger a relay for a porch light. It ignores small pets but picks up human motion consistently. The build quality feels solid for a module at this price point.
Anonymous
Mar 01, 2026
Rating: 4/5
Great learning component
My first time using a PIR sensor. The documentation online is plentiful, which helped me get started quickly. The only reason for 4 stars is that the pins are a bit close together for thick jumper wires, but it works fine with standard headers.
Q: Is this compatible with 5V logic boards like standard Arduino?
A: Yes, the module operates on DC 4.5V-20V, and the output high level is approximately 3.3V, which is sufficient to be read as a HIGH signal by 5V microcontrollers like the Arduino Uno.
Q: How do I adjust the sensitivity?
A: There is a potentiometer labeled 'S' on the board. Turning it clockwise increases the detection distance, while turning it counter-clockwise decreases it. Use a small screwdriver to make adjustments while testing.
Q: What is the difference between L and H trigger modes?
A: In 'H' (High) mode, the output stays high as long as motion is detected continuously. In 'L' (Low) mode, once motion is detected, the output goes high for the set delay time regardless of whether motion continues, effectively ignoring new triggers during that delay period.
Q: Can this sensor detect motion through glass?
A: No, PIR sensors generally cannot detect infrared radiation through glass as standard window glass blocks IR waves. The sensor needs a direct line of sight or an opening to detect motion effectively.
Q: Does this come with a lens cover?
A: The module comes with the standard white Fresnel lens dome pre-installed. This lens focuses the infrared energy onto the sensor element. No additional covers are included or required for standard operation.
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