Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	HC-SR501
Operating Voltage	DC 4.5V - 20V
Detection Distance	Up to 7 meters
Detection Angle	< 100 degrees cone angle
Trigger Mode	L (Repeatable) / H (Non-repeatable)
Delay Time	Adjustable from 5s to 300s
Blockade Time	Fixed at 2.5 seconds
PCB Dimensions	32mm x 24mm
Working Temperature	-15°C to +70°C
Output Signal	3.3V TTL High/Low

6 reviews

Anonymous

Mar 23, 2026

Rating: 4/5

Solid performance

Works as expected for a passive infrared sensor. It doesn't detect motion through glass, which is physics, not a defect. The output voltage is stable at 3.3V, perfect for microcontrollers.

Anonymous

Mar 20, 2026

Rating: 5/5

Great for learning

Used this for my final year project. The documentation online is plentiful, making it easy to interface with Raspberry Pi. The delay time adjustment is a nice feature to prevent false triggers.

Anonymous

Mar 12, 2026

Rating: 5/5

Perfect for Arduino Projects

This sensor works flawlessly with my Arduino Uno. The sensitivity adjustment pot is very responsive, and I was able to dial in the exact range I needed for my hallway light project. Great value for the price.

Anonymous

Mar 07, 2026

Rating: 4/5

Good sensor, needs calibration

The module arrived quickly and looks well-built. It took a minute or two to initialize after powering up, which is normal for PIR sensors. Once calibrated, it detects motion reliably. Just make sure you give it the correct voltage.

Anonymous

Mar 07, 2026

Rating: 5/5

Exceeded expectations

Very sensitive and accurate. I set the delay to the minimum for a quick test, and it reacted instantly to movement. The screw terminals are not present, so you will need to solder headers, but that's standard for this type of module.

Anonymous

Mar 04, 2026

Rating: 5/5

Reliable and Cheap

I bought five of these for a security prototype. All of them worked out of the box. The detection angle is wide enough to cover a standard doorway. Highly recommended for DIY electronics enthusiasts.

5 FAQ

Q: How long does it take for the sensor to initialize after power-on?

A: The sensor requires an initialization period of approximately 30 to 60 seconds after being powered on. During this time, it may output high signals intermittently; this is normal behavior.

Q: Does this module come with header pins soldered?

A: No, the module typically comes without pre-soldered headers to allow for flexible mounting options. You will need to solder your own 3-pin headers to connect it to a breadboard.

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 for the set delay time once motion is detected, ignoring further motion until the cycle completes.

Q: Will this sensor work outdoors in the rain?

A: The PCB itself is not waterproof. For outdoor use, you must house the module in a waterproof enclosure while ensuring the Fresnel lens has a clear view.

Q: Can this sensor be powered directly by a 5V USB power bank?

A: Yes, the HC-SR501 operates within a DC 4.5V to 20V range, so a standard 5V USB power source is perfectly suitable.

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