Attributes

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

6 reviews

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.

5 FAQ

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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