HC-SR501 Human Infrared Module Pyroelectric Infrared Sensor SR501 Blue or Green Board

This HC-SR501 human infrared module is a pyroelectric infrared sensor designed for detecting human motion in electronics projects. It is available in two board variants, SR501 blue board and SR501 green board, so you can choose the version that fits your circuit or replacement requirement. The module operates on a 33V power supply voltage and has a stated precision of 1x 2 degrees, giving a defined detection angle for motion-sensing tasks. Its response time is 1-3ms, which supports quick signal output when motion is detected within range. The operating temperature range is -15 to 70 degrees, allowing use in a variety of indoor and sheltered environments. This sensor is suited to DIY electronics, prototyping, and repair work where a specific PIR module is needed. The package includes one infrared receiver module. Because the source data is limited to these specifications, no further performance figures, certifications, or compatibility guarantees are stated. Buyers should check the blue board or green board option, the 33V supply requirement, and the -15 to 70 degrees operating range before ordering.

Features and Construction

The HC-SR501 module is built around a pyroelectric infrared sensor, which detects changes in infrared radiation caused by human movement. The source lists two board colour variants, blue and green, under the SR501 specification. The stated precision is 1x 2 degrees, and the response time is 1-3ms. These figures define the basic detection behaviour and reaction speed for the module as supplied. The operating temperature range of -15 to 70 degrees further describes the conditions in which the module is intended to work.

Material and Build

The sensor uses a pyroelectric infrared element, and the board is offered as SR501 blue board or SR501 green board. The source does not provide further material details such as board thickness, coating, or housing composition. The practical relevance of the pyroelectric element is that it responds to human infrared radiation, which is the basis for motion detection. The blue and green board options are the only construction variants stated, so selection should be based on that specification rather than on unstated differences.

Size and Practical Fit

No dimensions, weight, or mounting hole measurements are given in the source text. The stated precision of 1x 2 degrees is the only angular specification provided, and the 33V power supply voltage is the only voltage figure. These details help define the electrical and detection setup but do not describe physical size. Because size data is missing, buyers should not assume a particular footprint from this description. Fit and placement should be confirmed against the actual SR501 blue board or green board variant they select.

Uses and Placement

The HC-SR501 module is intended for human infrared detection in electronics work. It can be used in DIY circuits, motion-triggered prototypes, and replacement situations where an SR501 blue board or green board is required. The 1-3ms response time and -15 to 70 degrees operating range are the main stated use conditions. The 33V supply voltage and 1x 2 degrees precision also define how the module is set up electrically and optically. Placement should keep the sensor within the stated temperature range and connected to the correct supply voltage.

Event or Professional Use

In professional or project-based electronics, this module can serve as a motion-sensing input where human infrared detection is needed. The response time of 1-3ms allows for quick triggering in circuits that react to movement. The operating temperature range of -15 to 70 degrees supports use in environments that stay within those limits. The 1x 2 degrees precision gives a defined detection angle, which is useful when positioning the sensor for a specific area. The source does not state certifications or industrial ratings, so suitability for regulated or safety-critical systems should not be assumed.

Everyday Home Use

For home electronics projects, the HC-SR501 can be used in motion-activated circuits, DIY automation builds, or repair tasks where a PIR sensor module is required. The SR501 blue board and green board options allow matching an existing board colour or specification. The 33V supply voltage is a key requirement to observe during wiring. The -15 to 70 degrees range means the module is not described for extreme temperatures beyond that. No housing, lens, or mounting accessories are listed in the package contents, so only the module itself is supplied.

Benefits and Buying Value

The main value of this module lies in its stated response time, operating temperature range, supply voltage, precision, and board variant choice. It is a specific PIR sensor module for users who already know they need an HC-SR501 or SR501 board. The package contains one infrared receiver module. Because the source does not give pricing, savings, or comparison data, value should be judged on the stated specifications and the suitability of the blue board or green board option for the intended build.

Reuse and Low Maintenance

The source does not provide maintenance instructions, lifespan figures, or reuse claims. Practical care should be limited to handling the module carefully, keeping it within the stated -15 to 70 degrees operating range, and using the specified 33V power supply voltage. The pyroelectric infrared sensor element and SR501 board are the stated construction details. No cleaning agents, calibration procedures, or service intervals are described, so these should not be assumed. Buyers should follow general electronics handling practice and avoid exceeding the stated electrical or temperature limits.

Why Choose This Product

Choose this module if you need an HC-SR501 human infrared module with a pyroelectric infrared sensor and a choice of SR501 blue board or SR501 green board. The 1-3ms response time, 33V power supply voltage, 1x 2 degrees precision, and -15 to 70 degrees operating range are the concrete specifications provided. The package includes one infrared receiver module. No other contents, dimensions, or performance claims are stated in the source. This makes the product best suited to buyers who specifically require an SR501-type PIR module and can work within the listed specifications.