موديول سنسور حركة PIR صغير HC-SR505
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موديول سنسور حركة PIR صغير HC-SR505
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HC-SR505 Mini PIR Motion Sensing Module
The HC-SR505 is a compact, high-sensitivity motion sensor that utilizes Passive Infrared (PIR) technology to detect body heat. It is a smaller, "set-and-forget" alternative to the common HC-SR501, featuring a fixed default operation that makes it significantly easier to integrate into space-constrained projects. Due to its ultra-low power consumption and wide voltage range, it is particularly well-suited for battery-powered automation and security products.
Key Features
Passive Infrared Sensing: Detects motion by sensing changes in infrared radiation emitted by living beings.
Automatic & Repeatable Trigger: When motion is detected, the output goes HIGH for approximately 8–10 seconds. If motion continues, the timer resets, keeping the output HIGH until motion stops.
Compact Form Factor: Measuring only 34mm in total length, it fits into miniature electronic equipment and toys.
Ultra-Low Power: Draws less than 70µA, allowing it to be powered directly from a microcontroller's digital output pin if necessary.
Wide Voltage Range: Operates reliably between 4.5V and 20V, making it compatible with standard 5V systems and various battery packs.
Technical Specifications
| Parameter | Value |
| Operating Voltage | DC 4.5V – 20V |
| Quiescent Current | < 60µA (70µA typical) |
| Output Level | High (3.3V) / Low (0V) |
| Detection Distance | 3 meters (approx. 10 feet) |
| Detection Angle | < 100-degree cone angle |
| Delay Time | ~ 8 seconds (±30%) |
| Operating Temp | -20°C to +80°C |
Pin Configuration

| Pin | Label | Function |
| 1 | + | Connect to Power Supply (4.5V – 20V). |
| 2 | OUT | Digital Output (Active HIGH when motion is detected). |
| 3 | - | Connect to System Ground. |
Important Operational Notes
Power-On Calibration: Upon power-up, the sensor requires about 15 seconds to learn the ambient IR signature of its environment. Triggers during this "warm-up" period should be ignored.
Fresnel Lens: The white plastic dome (lens) increases the field of view to 100 degrees and protects the internal sensor windows.
Stability: Avoid placing the sensor near heat sources or in areas with high air turbulence, as these can cause false IR signatures.
Applications
Security: Motion-activated alarms and security cameras.
Automation: Body induction lamps, auto-sensing fans, and smart home lighting.
Industrial: Auto-sensing electrical equipment and industrial control systems.
Interactive Toys: "Body induction" toys and holiday props.
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سنسورات تقارب وحركة (الترا سونيك / IR / PIR)