HiLetgo 3pcs HC-SR501 PIR
4.4Editor score
Wide voltage range 4.5 to 20V
Adjustable delay time 5 to 200 seconds
Compact 32 by 24 millimeter size
In this guide
Choosing the right motion sensor for Arduino projects requires understanding different technologies like PIR and microwave detection. Each type offers unique benefits for home automation, security systems, and interactive installations.
We evaluated ten top-rated modules based on detection range, sensitivity adjustments, and compatibility with popular microcontrollers. Our analysis focuses on reliability, power consumption, and real-world performance across various applications.
Each pick highlights key features, pros, and cons to help you make an informed decision. Remember that availability and stock levels change frequently, so verify current details before purchasing your next component.
Top 3 Picks for Best Motion Sensor for Arduino
2-Pack HC-SR501 PIR Motion Sensor Module
4.8Editor score
Up to 7 meters detection range
Adjustable sensitivity and delay
Low power 65uA standby
CQRobot 10.525GHz Microwave Sensor
4.4Editor score
Doppler radar detection technology
Works through glass and walls
Immune to temperature and dust
Top 10 Best Motion Sensor for Arduino in 2026 Compared
This table provides a side-by-side comparison of all ten motion sensors, highlighting key specifications like voltage requirements, detection angles, and trigger modes to simplify your selection process.
ProductsSpecificationsEditor scorePrice
Best Budget
HiLetgo 3pcs HC-SR501
Voltage: 4.5 to 20V
Angle: Less than 100 degrees
Delay: 5 to 200 seconds
Trigger: Repeatable or Non-repeatable
4.4Editor score
Editor's Choice
WWZMDiB 5 Pcs PIR Sensor
Voltage: 4.5 to 20V
Angle: Less than 110 degrees
Range: 3 to 7 meters
Trigger: High or Low mode
4.2Editor score
Editor's Choice
2-Pack HC-SR501 PIR Module
Voltage: 3.6 to 30V
Angle: 110 degrees coverage
Range: Up to 7 meters
Power: Under 65uA standby
4.8Editor score
WWZMDiB 5Pcs AM312
Voltage: 2.7 to 12V
Delay: 2 seconds
Range: 3 to 5 meters
Trigger: Repeatable only
4.2Editor score
CQRobot 10.525GHz Microwave
Technology: Doppler radar
Detection: Non-living objects
Environment: Dust and humidity proof
Power: Static sensitive battery recommended
4.4Editor score
3-Pack HC-SR501 PIR Motion
Voltage: 4.5 to 20V
Angle: Less than 100 degrees
Delay: 5 to 200 seconds
Size: 32 by 24 millimeters
3.9Editor score
3 Pcs HC-SR501 Module
Voltage: 4.5 to 20V
Angle: Less than 120 degrees
Range: Within 7 meters
Includes: Mounting and wire kit
3.9Editor score
8pcs AM312 Sensor Mini
Voltage: 2.7 to 12V
Trigger: Repeatable high output
Size: Mini module design
Output: High and low levels
4.4Editor score
Mini Pyroelectric PIR Sensor
Voltage: 3.3 to 5V
Angle: Less than 100 degrees
Range: 3 to 5 meters
Temperature: minus 20 to 60 Celsius
4.8Editor score
KEYESTUDIO 48 Sensors Kit
Count: 48 sensor modules
Includes: Motion and pressure sensors
Support: Detailed tutorials provided
Level: Beginner to advanced projects
4.5Editor score
1. 2-Pack HC-SR501 – Best Overall Motion Sensor
2-Pack HC-SR501 PIR Motion Sensor Module
Up to 7 meters detection range
Adjustable sensitivity and delay times
Low power 65uA standby consumption
3.6 to 30V wide operating voltage
This module offers outstanding value with its high rating and impressive range. It detects motion up to seven meters away with a hundred ten degree coverage area.
Pros
- Exceptional detection range
- Flexible sensitivity adjustments
- Very low power draw
- Wide voltage compatibility
- Green PCB durability
Cons
- Standard Fresnel lens limitations
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The onboard potentiometers allow you to tweak sensitivity and delay time precisely. This makes it perfect for lighting control or security alarms that need customization.
While it uses a standard lens, the performance is robust enough for most indoor and outdoor projects. The low power draw is ideal for battery powered setups.
Buy this if you need a reliable all-rounder for Arduino projects. It balances cost and performance better than most competitors in this category.
Enhanced Range and Accuracy
The built-in Fresnel lens boosts signal strength, ensuring reliable detection up to seven meters. This is crucial for covering larger rooms or hallways effectively.
Energy Efficiency
Consuming under 65 microamps in standby mode saves battery life. This feature makes it a top choice for solar or battery operated IoT devices.
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2. HiLetgo 3pcs HC-SR501 – Best Budget Motion Sensor
HiLetgo 3pcs HC-SR501 PIR Infrared Sensor
Voltage range 4.5 to 20V
Delay time 5 to 200 seconds
Angle sensor less than 100 degrees
Dimensions 32 by 24 millimeters
This pack gives you three modules at a great price point. It is perfect for builders who need multiple sensors for a larger project or spare parts.
Pros
- Very affordable multi pack
- Wide voltage range
- Long adjustable delay
- Compact footprint
- Standard trigger modes
Cons
- Basic packaging quality
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The adjustable delay and voltage range make it versatile for different power sources. You can set the delay up to 200 seconds for long monitoring periods.
The build quality is standard for this price range but works well for prototyping. The compact size fits easily into tight project enclosures without issues.
Choose this if budget is your primary concern. You get reliable functionality without paying for premium features you might not need.
Cost Effective Multi Pack
Buying three units allows for redundancy or multi zone detection. This value proposition is hard to beat for beginners or large scale deployments.
Flexible Timing Options
The delay ranges from seconds to minutes. This flexibility supports applications like hallway lighting that stays on while people are present.
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3. CQRobot 10.525GHz Microwave Sensor – Best Premium Motion Sensor
CQRobot 10.525GHz Microwave Sensor
Doppler radar technology
Detects non-living objects
Immune to dust and humidity
Static sensitive requires battery test
This microwave sensor uses Doppler radar instead of infrared. It detects movement through glass and plastic which infrared sensors cannot do effectively.
Pros
- Penetrates glass and plastic
- High reliability in bad weather
- Detects all moving objects
- Strong RF interference protection
- Long detection distance
Cons
- Requires careful power handling
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It works in harsh environments where dust or humidity might block optical sensors. The high frequency output ensures stability against electrical interference.
The main trade-off is the need for careful power supply handling to avoid static damage. However, the detection quality is unmatched for industrial uses.
Buy this for projects requiring high reliability in difficult conditions. It is the premium choice for automatic doors or security systems.
Advanced Radar Technology
Microwave waves pass through non-metallic barriers seamlessly. This allows sensors to be hidden inside enclosures or behind protective covers.
Environmental Robustness
Since it does not rely on heat or light, it ignores temperature changes and air flow. This ensures stable operation in noisy industrial settings.
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4. WWZMDiB 5 Pcs PIR Sensor – Reliable Multi Pack
WWZMDiB 5 Pcs PIR Sensor
Detection angle less than 110 degrees
Range 3 to 7 meters
Voltage DC 4.5 to 20V
Trigger modes H and L selectable
This set includes five modules and two cases for protection. The cases help organize your workspace and protect the sensors during transport.
Pros
- Includes dedicated cases
- Five unit bulk pack
- Adjustable detection range
- Compatible with STM32
- Standard PIR performance
Cons
- Average trigger mode reliability
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The performance matches standard PIR modules with a good range and angle. You can switch between high and low trigger modes easily via jumper settings.
While the cases are a nice touch, the sensor electronics are similar to other generic units. They work well for home automation and simple security tasks.
Pick this if you want protection cases included. It is a solid choice for beginners who need organization and multiple sensors.
Protective Enclosures
The included cases shield the sensors from physical damage. This is helpful for projects where the modules might be moved frequently.
Trigger Mode Options
Selecting H or L modes changes how the output behaves. This allows flexibility for different logic needs in your Arduino code.
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5. WWZMDiB 5Pcs AM312 – Compact Mini Sensor
WWZMDiB 5Pcs AM312
Voltage DC 2.7 to 12V
Sensing range 3 to 5 meters
Trigger mode repeatable
Delay time 2 seconds
The AM312 modules are much smaller than standard PIR units. They are ideal for projects with tight space constraints or hidden mounting spots.
Pros
- Mini size design
- Low voltage operation
- Repeatable trigger mode
- Cost effective bulk buy
- High sensitivity control
Cons
- Fixed delay time
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They operate on lower voltage which is great for battery powered devices. The repeatable trigger mode ensures the output stays high during motion.
The delay is fixed at two seconds which limits some timing flexibility. However, the compact size often outweighs this for specific mini projects.
Buy this when space is limited. The small footprint allows for cleaner designs where large modules would not fit.
Space Saving Form Factor
The mini size lets you mount sensors in tight corners. This makes it perfect for wearable tech or small IoT gadgets.
Low Power Requirements
Running on as low as 2.7 volts saves energy. This extends battery life for remote sensors that run for months.
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6. 3-Pack HC-SR501 – Standard Adjustable Sensor
3-Pack HC-SR501 PIR Motion Sensor
Delay 5 to 200 seconds
Sensing distance adjustable
Voltage 4.5 to 20V
Jumper switch trigger modes
This pack offers standard functionality with adjustable delay times. The potentiometer lets you fine tune the detection based on your needs.
Pros
- Standard delay control
- Repeatable trigger option
- Wide voltage range
- Three unit supply
- Basic documentation provided
Cons
- Lower rating than others
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The wide voltage range makes it flexible for different power supplies. However, user feedback suggests some units might be less consistent.
The jumper switch allows you to choose repeatable or non-repeatable modes. This helps avoid false triggers in certain environments.
Choose this if you need a basic unit without extra features. It works well for simple lighting or alarm systems.
Adjustable Detection Settings
Fine tuning the delay helps match specific room sizes. This reduces the chance of lights turning off too early.
Trigger Mode Selection
The jumper setting gives you control over output behavior. This is useful for integrating with complex logic chains.
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7. 3 Pcs HC-SR501 – Kit with Accessories
3 Pcs HC-SR501 PIR Motion Sensor Module
Less than 120 degrees angle
Within 7 meters range
Includes probe holder kit
Includes dupont wires and screws
This option includes a full set of mounting hardware and wires. The probe holder helps secure the sensor in place securely.
Pros
- Complete accessory kit
- Mounting screws included
- Dupont wires provided
- Wide angle coverage
- Basic wiring tools
Cons
- Accessories vary in quality
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Having screws and wires ready saves time on assembly. The angle coverage is wider than some other standard modules.
The quality of accessories is functional but basic. They work for prototyping but might need replacement for permanent installs.
Buy this if you want everything in one box. It simplifies the initial setup process for your project.
All in One Kit
The included hardware means fewer separate purchases. This is convenient for quick prototyping or classroom projects.
Wide Angle Coverage
A larger angle helps cover more space with one unit. This reduces the number of sensors needed for a room.
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8. 8pcs AM312 Sensor Mini – Bulk Mini Pack
8pcs AM312 Sensor Mini
Repeatable trigger mode
Small size design
Internal digital signal processing
High and low level output
This pack gives you eight mini modules at a great value. The small size is perfect for embedding into devices where space is tight.
Pros
- Eight unit bulk supply
- Mini module size
- Digital signal processing
- Low power consumption
- Repeatable output mode
Cons
- Standard delay times
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Internal digital processing helps filter noise and improve reliability. The output stays high as long as movement is detected.
It runs on low voltage which is ideal for portable gadgets. The bulk quantity ensures you have spares for testing.
Pick this for projects requiring many small sensors. It offers a good balance of cost and compact design.
Signal Processing
Built-in digital processing reduces false alarms. This ensures the sensor only reacts to genuine motion signals.
Compact Embedding
The small size allows for neat integration. You can hide these inside casings without affecting the look.
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9. Mini Pyroelectric PIR Motion Sensor – Low Voltage Friendly
Mini Pyroelectric PIR Motion Sensor
Operating temperature minus 20 to 60
Five piece compact design
Range 3 to 5 meters
3.3 to 5V microcontrollers
This module is designed for low voltage microcontrollers like ESP32. It fits perfectly with modern Wi-Fi enabled projects.
Pros
- Compact design
- Low power usage
- Wide temperature range
- High rating reliability
- Compatible with ESP boards
Cons
- Limited range compared to others
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The high rating shows reliable performance in various conditions. It works well in moderate temperatures without issues.
While the range is shorter than larger PIR units, it is sufficient for close proximity detection. The compact size makes it versatile.
Buy this if you are using ESP boards. It integrates seamlessly with 3.3V logic systems.
Microcontroller Compatibility
Designed for 3.3V boards like ESP8266. This avoids needing level shifters in your circuit design.
Embedded Installation
The compact design supports easy integration. You can fit it into tight enclosures without much effort.
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10. KEYESTUDIO 48 Sensors Modules – Comprehensive Starter Kit
KEYESTUDIO 48 Sensors Modules Starter Kit
Contains 48 pieces
Includes tutorial wiki
Compatible with Mega 2560
Includes motion sensor module
This kit provides a wide variety of sensors including a motion unit. It is perfect for beginners learning electronics and Arduino.
Pros
- 48 sensor modules
- Includes motion sensor
- Detailed tutorials
- Beginner friendly packaging
- Variety of components
Cons
- Not a standalone sensor
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The included tutorials help you understand how to wire and code each sensor. This reduces the learning curve for new users.
While not a dedicated motion sensor unit, the variety offers broad learning options. You get access to many different sensor types in one box.
Buy this to learn broadly. It is the best choice for educational purposes or general experimentation.
Educational Value
The extensive tutorials guide you through each module. This helps you learn how different sensors work in practice.
Variety of Modules
Access to 48 different modules expands project ideas. You can mix and match to create complex systems.
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Buying Guide – How to Choose the Best Motion Sensor for Arduino
Selecting the right motion sensor involves understanding detection types, voltage needs, and environmental requirements. Here are the key factors to consider.
Detection Technology
Passive Infrared (PIR) is common for detecting human movement based on heat. Microwave sensors use Doppler radar and work through glass but may be sensitive to other movement.
Choose PIR for simple human detection and microwave for environments with obstacles.
Voltage Compatibility
Arduino boards typically run at 5V but some like ESP8266 use 3.3V. Ensure your sensor supports your board logic voltage to avoid damage.
Check the operating voltage range before connecting to your microcontroller.
Detection Range and Angle
PIR sensors usually cover up to 7 meters with a cone angle. Wider angles cover more area but may be less precise.
Match the range to your room size to ensure full coverage.
Adjustability and Delay
Many modules let you set the delay time and sensitivity via potentiometers. This helps avoid false alarms in windy areas.
Look for adjustable features if you need fine tuning.
Power Consumption
Battery projects need low standby current. PIR sensors like the HC-SR501 use under 50uA which is efficient.
Pick low power models for wireless or battery setups.
Mounting and Size
Standard modules are around 32mm by 24mm. Mini modules save space in small enclosures.
Consider the physical dimensions for your project housing.
Environment and Durability
Outdoor use requires weather resistance. Microwave sensors handle dust and humidity better than PIR.
Select rugged models for harsh conditions.
Trigger Modes
Repeatable trigger keeps output high while motion exists. Non-repeatable triggers only once per event.
Choose based on your application logic needs.
How to Use and Care for Your Motion Sensor for Arduino
Connect the VCC pin to your Arduino power pin and GND to ground. Attach the OUT pin to a digital input pin like D2 or D3.
Upload sample code to read the digital signal. Use Serial Monitor to debug the output state when motion occurs.
Adjust the potentiometers carefully with a small screwdriver. Mount the sensor securely to avoid vibration causing false triggers.
Frequently Asked Questions
What is the difference between PIR and microwave motion sensors?
PIR sensors detect heat changes from humans and animals. Microwave sensors use radio waves to detect any movement. Microwave works through glass but costs more.
Can I use a 5V sensor on a 3.3V board?
Check if the sensor output is 3.3V compatible. If not, use a voltage divider to avoid damaging your board. Some sensors support both voltages.
Why does my sensor trigger false alarms?
Heat sources or airflow may cause this. Adjust sensitivity and check wiring for loose connections. Ensure the lens is clean.
How far can a typical Arduino motion sensor detect?
Most PIR sensors detect up to 7 meters. Range depends on angle and sensitivity settings. Larger lenses usually offer better range.
Can I wire multiple sensors to one Arduino pin?
You cannot wire multiple outputs to one input directly. Use different pins or combine signals with logic gates. Each sensor needs its own pin.
What code library do I need for HC-SR501?
No library is needed for digital input. Use standard digitalRead() function. Many tutorials provide simple examples for beginners.
Are these sensors waterproof for outdoor use?
Most are not waterproof. You need to mount them in a protective case. Microwave sensors are often more resistant to moisture.
How long does a motion sensor module last?
They last years if used within voltage limits. Prolonged heat exposure reduces lifespan. Check for wear on solder joints.
Final Thoughts on Choosing the Best Motion Sensor for Arduino
We reviewed ten top motion sensors including HC-SR501 PIR and microwave options. Each offers unique benefits depending on your project needs.
Prioritize power consumption and voltage compatibility for successful integration. Match the detection range to your specific application.
Check current stock and availability before buying. Prices may fluctuate so compare options at the time of purchase.