HC-SR505 Mini PIR Motion Sensor Module – 4.5-20V, 3.3V Output, 3m Detection

The HC-SR505 is an ultra-compact PIR motion sensor module designed for reliable human body detection in security, lighting, and automation projects. It operates from a wide DC voltage range of 4.5V to 20V and draws less than 60µA in quiescent mode, making it well suited to battery-powered and low-energy applications. The module provides a digital TTL-compatible output that switches between 0V (low) and 3.3V (high) when motion is detected, allowing direct connection to microcontroller GPIO pins or relay driver circuits. Its pyroelectric sensor and Fresnel lens focus infrared radiation from warm moving bodies, and the onboard transistor inverts the signal to produce a clean output for logic circuits.

The HC-SR505 offers a sensing distance of up to 3 meters with a detection cone angle of less than 100 degrees, and it features a default delay time of approximately 8 seconds (±30%) with repeatable triggering. The board measures only 10 × 23 mm, supports an operating temperature range of -20°C to +80°C, and requires a warm-up and calibration period of roughly 10 to 60 seconds after power-up. Typical applications include automatic lighting for homes and parking areas, intrusion alarms, automatic doors, and DIY electronics projects that require compact, low-power motion sensing.

1. Security systems and intrusion alarms.
2. Smart lighting for homes, corridors, and parking areas.
3. Automatic doors and gate control.
4. Arduino, ESP32, and other microcontroller-based motion detection projects.
5. Battery-powered devices requiring low quiescent current.

1. Model: HC-SR505.
2. Operating voltage: 4.5V to 20V DC.
3. Quiescent current: less than 60µA.
4. Output type: digital (TTL-compatible).
5. Output voltage level: 3.3V high / 0V low.
6. Sensing distance: up to 3 meters.
7. Detection angle: less than 100 degrees cone angle.
8. Delay time: default 8 seconds ±30% (repeatable trigger).
9. Warm-up / calibration time: 10 to 60 seconds.
10. Operating temperature range: -20°C to +80°C.
11. Board dimensions (L × W): 10 × 23 mm.