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HC-SR501 PIR motion sensor compatible with Arduino for DIY projects
Brand: satkit
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The HC-SR501 PIR motion sensor is an electronic component designed to detect movement using passive infrared technology, compatible with Arduino platforms. This sensor is ideal for automation, security and robotics projects, offering a reliable and simple solution for detecting human or animal presence in a given area.
Main features:
- Adjustable sensitivity: Allows the detection distance to be set between 3 and 7 metres, adapting to different project needs.
- Adjustable hold time: The time the sensor keeps the signal active can be adjusted from 3 to 200 seconds, providing flexibility in response.
- Supply voltage range: Works with direct current between 4.5V and 20V, making it easy to integrate with various power sources.
- Low standby consumption: Consumes less than 50 microamperes when idle, ideal for projects that require energy efficiency.
- Digital output: Provides a high level of 3.3V when motion is detected and a low level of 0V when there is none.
- Trigger modes: Can be configured for single trigger (non-retriggerable) or repeat trigger by jumper in L or H position respectively.
- Wide operating temperature range: Operates efficiently between -15°C and +70°C, suitable for various environmental conditions.
- Compact dimensions: Board size 32mm x 24mm x 25mm and lens diameter 23mm, making it easy to mount in tight spaces.
- Detection angle: Less than 100°, covering a wide area for motion detection.
Typical uses:
- Automation projects for switching lights or alarms on.
- Security systems for detecting intruders.
- Robotics for responding to presence or movement.
- DIY devices that require proximity or motion detection.
Compatibility: This sensor is fully compatible with Arduino boards, making it easy to program and connect using standard pins. Its digital output allows simple integration with microcontrollers and embedded systems.
In short, the HC-SR501 PIR sensor is a versatile and efficient component for any electronics enthusiast and DIY project developer looking for a reliable motion detection solution.
- Adjustable sensitivity between 3 and 7 metres for accurate detection
- Configurable hold time from 3 to 200 seconds
- 4.5V to 20V DC power supply
- Low standby consumption of less than 50 microamperes
- 3.3V high / 0V low digital output
- Single or repeat trigger modes via jumper
- Operating temperature range from -15°C to +70°C
- Compact size: 32x24x25 mm and 23 mm diameter lens
- Detection angle under 100° for wide coverage
Customer Questions & Answers
What is the maximum distance and effective detection angle of the HC-SR501 compared with other standard PIR sensors?
The HC-SR501 has an adjustable detection distance of 3 to 7 metres and a detection angle of less than 100°. This coverage is average compared with standard PIR sensors, which usually range between 5 and 12 metres and angles between 90° and 120°. For larger-area applications, there are models with greater ranges and angles.
What materials make up the sensor and what space does it take up on a breadboard?
The module uses a PCB with electronic components and a 23 mm diameter plastic Fresnel lens. Its physical dimensions are 32 mm × 24 mm × 25 mm, ideal for breadboard prototypes or integration into compact enclosures.
Does the HC-SR501 require periodic maintenance and what affects its durability?
It does not require routine maintenance. For maximum durability, it is recommended to avoid prolonged exposure to humidity, dust or sudden temperature changes (>70°C or <–15°C), as these can affect the lens or internal circuits.
What common problems does it present and how can they be solved?
The most common problems are false detections (nearby heat sources or interference), short range (incorrect potentiometer adjustment) or unstable outputs (unregulated power supply). The recommendation is to check the wiring, adjust sensitivity and use a stable power supply within the indicated range.
What is the detection range of the HC-SR501 PIR sensor?
The sensor has an adjustable detection range between 3 and 7 metres.
Is the HC-SR501 sensor compatible with Arduino?
Yes, the sensor is compatible with Arduino boards and can be easily integrated into DIY projects.
What supply voltage does the sensor require?
It works with a direct current supply voltage between 4.5V and 20V.
Can the time the sensor keeps the signal active be adjusted?
Yes, the hold time is adjustable from 3 to 200 seconds.
What is the sensor's standby current consumption?
Standby consumption is less than 50 microamperes, making it energy efficient.
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