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HC-SR501 PIR Motion Sensor Module – Adjustable Infrared Detector (Arduino Compatible)
The HC-SR501 PIR (Passive Infrared) Motion Sensor Module is a reliable and easy-to-use solution for detecting movement in electronics projects. It senses changes in infrared radiation emitted by people or animals, triggering an output when motion is detected within its range.
With adjustable sensitivity and delay time, the module can be fine-tuned to suit different classroom and project environments. It operates using a digital output, making it simple to interface with Arduino, ESP32, and other microcontrollers.
Widely used in security systems, lighting control, and automation projects, the HC-SR501 is ideal for teaching how sensors interact with real-world inputs. It provides a practical way for students to explore motion detection, timing, and control systems in STEM learning.
Key Features
- Detects motion using passive infrared (PIR) technology
- Adjustable sensitivity (range) and delay time
- Digital HIGH/LOW output signal
- Repeatable and non-repeatable trigger modes
- Compatible with Arduino, ESP32, and similar boards
- Easy 3-pin interface (VCC, OUT, GND)
Classroom Applications
- Motion-activated lighting systems
- Security alarm projects
- Smart room or automation simulations
- Teaching sensor-based input systems
- Exploring timing and delay functions in code
Australian Curriculum Links
Aligned with Design and Technologies and Digital Technologies:
- ACTDIK024 / ACTDIK034 – Collecting and interpreting data from sensors
- ACTDEP016 / ACTDEP025 – Designing and implementing digital solutions
- ACTDEK019 – Understanding electrical systems and components
- ACTDIK036 – Designing interactive systems with user input
Supports development of:
- Computational thinking and logic
- Real-world problem solving
- Understanding of sensors and automation systems
Year Level Suitability
- Years 7–10: Introduction to sensors, inputs, and simple automation
- Years 9–12: Advanced projects involving timing, control systems, and coding logic
- Suitable for beginners with guided instruction
Lesson & Project Ideas
- Motion-Activated Light: Turn an LED on when movement is detected
- Intruder Alarm System: Trigger a buzzer or siren when motion occurs
- Smart Room Prototype: Automate lights or devices based on occupancy
- Timing Investigation: Adjust delay settings and measure output duration
- Energy Efficiency Project: Simulate automatic lighting systems for classrooms
Technical Specifications
- Model: HC-SR501
- Operating Voltage: 5V–20V
- Output Voltage: 3.3V (HIGH) / 0V (LOW)
- Detection Range: Up to ~7 metres (adjustable)
- Detection Angle: <120°
- Delay Time: Adjustable (~3 seconds to 5 minutes)
- Trigger Modes: Repeatable (H) / Non-repeatable (L)
- Sensor Type: Passive Infrared (PIR)
