Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	HC-SR501
Operating Voltage	DC 4.5V - 20V
Detection Angle	< 100 degrees cone angle
Detection Distance	3 to 7 meters (adjustable)
Trigger Mode	L (Low) and H (High) selectable via jumper
Delay Time	5s to 300s (adjustable potentiometer)
Blockade Time	2.5s (default, non-adjustable)
Output Signal	High level 3.3V / Low level 0V
PCB Dimensions	32mm x 24mm
Working Temperature	-15°C to +70°C

6 reviews

Anonymous

Mar 31, 2026

Rating: 4/5

Good sensor, needs calibration

The module arrived quickly and looks well-built. It took a minute or two to warm up before it started detecting motion accurately, which is normal for PIR sensors. Once calibrated, it has been reliable for my security prototype.

Anonymous

Mar 23, 2026

Rating: 5/5

Easy to use for beginners

I am new to electronics, but the pinout is clearly labeled. Connecting VCC, GND, and OUT was straightforward. The included potentiometers make it easy to tweak the timing without writing complex code immediately.

Anonymous

Mar 14, 2026

Rating: 5/5

Bought 10 for our class

We purchased a batch of these for our high school robotics club. All units functioned correctly out of the box. They are robust enough to handle student handling and provide consistent output signals.

Anonymous

Mar 10, 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 where I needed it for my hallway light project. Great value for the price.

Anonymous

Mar 06, 2026

Rating: 4/5

Solid performance, wide voltage range

Appreciate that this runs on up to 20V, making it versatile for different power setups. The detection angle is wide as advertised. Only minor issue is the pins were slightly bent upon arrival, but easily fixed.

Anonymous

Mar 04, 2026

Rating: 5/5

Reliable induction switch

Using this to trigger a camera trap. The delay time adjustment is crucial for this application, and the HC-SR501 handles it perfectly. No false triggers from wind or small insects so far.

5 FAQ

Q: What is the difference between L and H trigger modes?

A: In 'H' mode, the output stays high as long as motion is detected continuously. In 'L' mode, the output goes high once when motion is detected and stays high for the set delay time, ignoring further motion during that period.

Q: Is the output current sufficient to drive an LED directly?

A: The output current is generally low. While it might light a small indicator LED, we recommend using a transistor or relay module to drive higher-power loads like strips or bulbs.

Q: How long does the sensor need to warm up after power-on?

A: Typically, the sensor requires an initial warm-up period of about 30 to 60 seconds after being powered on to stabilize and begin accurate detection.

Q: Does this module come with a Fresnel lens installed?

A: Yes, the white dome-shaped Fresnel lens is pre-installed on the module to focus infrared signals onto the sensor element.

Q: Can this sensor detect motion through glass?

A: No, PIR sensors cannot detect infrared radiation through glass. The lens must have a direct line of sight to the moving heat source.

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