Attributes

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

6 reviews

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.

5 FAQ

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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