RoboEssentials
HC-SR501 PIR Motion Sensor Module for Arduino, ESP32 & Home Automation
HC-SR501 PIR Motion Sensor Module for Arduino, ESP32 & Home Automation
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The HC-SR501 PIR Motion Sensor Module detects movement using passive infrared technology. It is ideal for Arduino, ESP32, smart lighting, security systems, home automation, robotics and DIY electronics projects.
Technical Specifications
| Specification | Details |
|---|---|
| Sensor Type | PIR Motion Sensor |
| Module | HC-SR501 |
| Operating Voltage | Commonly 5V–20V DC |
| Output | Digital |
| Detection Range | Adjustable, typically up to ~7 m |
| Detection Angle | Up to approximately 120° |
| Delay Time | Adjustable |
| Sensitivity | Adjustable |
| Trigger Mode | Repeatable / Single Trigger* |
| Warm-up Time | Typically around 1 minute |
*Exact behavior can vary by module version.
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Key Features
Key Features
PIR-based motion detection
Detects movement of people and warm objects
Adjustable sensitivity
Adjustable time delay
Selectable trigger mode
Digital output
Compact module
Easy Arduino integration
Compatible with ESP32
Suitable for automation projects
Applications
Applications
Motion Detection
Security Alarm
Automatic Lighting
Smart Home Automation
Energy Saving Systems
Automatic Door Projects
Robotics
IoT Projects
Arduino Projects
ESP32 Projects
Motion-Activated Buzzer
Smart Lighting
School Projects
College Projects
Engineering Projects
Package Includes
Package Includes
1 × HC-SR501 PIR Motion Sensor Module
Compatibility
Compatibility
Frequently Asked Questions
Frequently Asked Questions
What does HC-SR501 detect?
It detects changes in infrared radiation caused by moving objects, particularly people and other warm objects.
Can I use it with Arduino Uno?
Yes. Its digital output can be connected to an Arduino digital input.
Can I use it with ESP32?
Yes. Ensure the signal voltage is appropriate for the ESP32 GPIO.
Can I adjust the detection distance?
Yes. The sensitivity adjustment can be used to change the effective detection range.
Can I adjust how long the output stays active?
Yes. The delay adjustment allows you to configure the output duration.
Does it detect a stationary person?
PIR sensors primarily detect changes/movement in infrared radiation, so they are better suited to detecting movement rather than simply detecting a stationary person.
Can it be used for automatic lights?
Yes. It is commonly used in motion-activated lighting projects.
