Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	HC-SR501
Detection Angle	< 100 degrees cone angle
Detection Distance	3 to 7 meters (adjustable)
Operating Voltage	DC 4.5V - 20V
Quiescent Current	< 50uA
Output Signal	High level 3.3V / Low level 0V
Trigger Mode	L (Non-retriggerable) / H (Retriggerable)
Delay Time	Adjustable from 5s to 300s
PCB Dimensions	32mm x 24mm
Operating Temperature	-15°C to +70°C

6 reviews

Anonymous

Mar 27, 2026

Rating: 5/5

Perfect for Arduino projects

This sensor works flawlessly with my Arduino Uno. The sensitivity adjustment potentiometers are very responsive, allowing me to fine-tune the detection range for my hallway light project. Great value for the price.

Anonymous

Mar 25, 2026

Rating: 4/5

Good sensitivity but needs calibration

The module detects motion reliably once you spend some time calibrating the two dials. Initially, it was triggering too often, but after adjusting the delay and sensitivity, it works great for my security prototype.

Anonymous

Mar 22, 2026

Rating: 5/5

Reliable and consistent

Bought five of these for a robotics class. All units performed consistently with similar detection ranges. The retriggerable mode is excellent for keeping lights on while movement is continuous.

Anonymous

Mar 19, 2026

Rating: 3/5

Works well but warm-up time needed

The sensor functions as described, but you must wait about a minute after powering it up for it to stabilize. If you try to test it immediately, it might give false triggers. Just be patient.

Anonymous

Mar 09, 2026

Rating: 5/5

Easy to use for beginners

I am new to electronics, and this module made my first motion-sensing lamp very easy to build. The pinout is clearly marked, and there are plenty of tutorials online. Highly recommended for starters.

Anonymous

Mar 08, 2026

Rating: 5/5

Best PIR sensor in this price range

I have tried several different PIR modules, and the HC-SR501 offers the best balance of adjustability and reliability. The PCB quality is solid, and the soldering points are easy to work with.

5 FAQ

Q: What is the maximum current this module can switch directly?

A: This module outputs a logic signal (3.3V) and cannot drive high-power loads directly. You should use a relay or a transistor/MOSFET to control devices like lamps or motors.

Q: Does this come with the Fresnel lens dome attached?

A: Yes, the module comes pre-assembled with the white Fresnel lens dome installed. It is removable if you need to access the sensor element underneath.

Q: Is this compatible with 5V Raspberry Pi GPIO pins?

A: Yes, the output high level is approximately 3.3V, which is safe for Raspberry Pi GPIO input pins. Ensure you connect the VCC to the 5V pin on the Pi.

Q: How do I switch between L and H trigger modes?

A: There is a jumper cap on the PCB labeled 'H' and 'L'. Place the jumper on 'H' for retriggerable mode (output stays high while motion continues) or 'L' for non-retriggerable mode.

Q: Can this sensor detect motion through glass or thin plastic?

A: No, infrared radiation cannot pass through glass. The sensor lens must have a direct line of sight to the moving object. Thin plastic may reduce sensitivity significantly.

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