HC-SR505 Mini Infrared PIR Motion Sensor Module

HC-SR505 Mini Infrared PIR Motion Sensor Module is an ultra-compact, highly reliable passive infrared module specifically engineered for low-power, automatic body sensing applications. Utilizing standard pyroelectric infrared technology, it accurately detects the thermal footprint of human movement while deliberately minimizing its own electrical footprint. Consequently, this miniature sensor is heavily favored by DIY enthusiasts and hardware engineers for battery-powered automatic lighting, discrete security alarms, and smart home IoT networks. Unlike its larger counterpart, the HC-SR501, this mini module utilizes a fixed-lens design that entirely eliminates the need for manual sensitivity or delay adjustments, ensuring foolproof factory-level calibration. Furthermore, its impressively wide voltage tolerance and near-zero quiescent current allow it to run continuously for months on simple logic-level power supplies or lithium batteries. Therefore, whether you are embedding motion detection into a small 3D-printed desk lamp or a hidden hallway sensor, the HC-SR505 provides seamless, zero-configuration automation.

Key Features:

• Ultra-Compact Profile: The incredibly narrow 10mm lens and slender PCB allow the module to easily integrate into very cramped enclosures where standard PIR domes cannot physically fit.
• Low Power Consumption: Drawing less than 60μA in standby mode, it consequently extends the operational life of battery-driven systems significantly.
• Repeatable Trigger Mode: Intelligently extends the HIGH output signal if continuous motion is detected within its sensing zone, preventing lights or alarms from shutting off prematurely.
• Fixed Factory Calibration: Devoid of bulky adjustment potentiometers, perfectly standardizing the 3-meter detection range and 8-second delay time for mass production reliability.
• Wide Input Voltage: Seamlessly accepts any DC power source from 4.5V up to 20V, matching perfectly with existing 5V USB logic or 12V automotive power lines.

Technical Specifications:

• Operating Voltage (V_CC): 4.5 V to 20.0 V DC (Optimal 5V)
• Logic Output Voltage: 3.3 V (HIGH on motion) / 0 V (LOW)
• Quiescent Current: < 60 μA
• Detection Angle: ≤ 100 degrees (Cone angle)
• Detection Range: Up to 3.0 meters (Fixed, non-adjustable)
• Delay Time: 8.0 seconds ±30% (Fixed, non-adjustable)
• Trigger Mode: Repeatable Trigger (Default)
• Operating Temperature: −20°C to +80°C

Mechanical Specifications:

• Lens Material: White, high-density polyethylene (HDPE) micro-Fresnel dome lens
• Board Material: Multi-layer FR4 Fiberglass PCB
• Mounting Support: Generally secured using silicone adhesive, hot glue, or by friction-fitting the 10mm dome through a pre-drilled enclosure hole.
• Sensor Element: Passive pyroelectric infrared detector
• Weight: ≈ 3.0 grams

Dimensions:

• Board Length: ≈ 23.0 mm (Up to 40.0 mm including standard header pins)
• Board Width: ≈ 10.0 mm
• Dome Diameter: ≈ 10.0 mm
• Total Height: ≈ 12.0 mm

Pinout and Wiring:

• VCC / + : Connect to a reliable DC power supply (4.5V to 20V).
• OUT : Connect this 3.3V digital logic pin directly to an interrupt or data input pin on your microcontroller (Arduino, Raspberry Pi, etc.).
• GND / – : Connect firmly to the common ground of your power supply.
• Wiring Note: Always verify the pinout printed on the underside of the PCB before connecting. However, reversing the VCC and GND connections will permanently damage the delicate internal voltage regulator.

Datasheet Reference:

• Download HC-SR505 Mini PIR Motion Sensor Datasheet

Commonly Used in:

• Battery-Powered Nightlights: Fitting neatly inside small wall sockets or portable puck lights without rapidly draining the internal cells.
• Toy Manufacturing: Triggering sound effects or motor movements precisely when a child interacts with an electronic toy.
• Closet Automation: Automatically engaging narrow LED light strips the moment a closet or cabinet door is opened.

Applications:

• Museum Displays: Spotlighting specific glass display cases strictly when a visitor closely approaches the exhibit specifically.
• Embedded Security Nodes: Concealing movement detectors inside everyday household objects like clocks or smoke alarms consequently.
• Energy Efficient Monitors: Putting computer kiosks or digital signage into standby mode when the immediate vicinity is empty.

Equivalent Models:

• AM312: A significantly smaller mini PIR module boasting a very similar range but operating on a slightly lower voltage threshold.
• SR602: Known for extreme sensitivity and a massive voltage tolerance, however possessing a marginally larger micro-lens than the 505.
• HC-SR501: The heavy-duty standard PIR motion sensor featuring adjustable sensitivity and delay potentiometers, but requiring almost triple the mounting space.

Package Includes:

• 1 x HC-SR505 Mini Infrared PIR Motion Sensor Module