MH-SR602 MINI Motion Sensor Detector Module

MH-SR602 MINI Motion Sensor Detector Module is a high-sensitivity, ultra-small pyroelectric infrared (PIR) sensing solution designed for compact security and automation projects. This module utilizes advanced infrared technology to detect the thermal signatures of moving objects, primarily human bodies, within its detection range. Consequently, it offers a much smaller footprint than the traditional HC-SR501, making it perfect for wearable electronics and discreet monitoring systems. The sensor provides a high-level digital output signal whenever it senses movement. Furthermore, its low power consumption ensures that battery-operated devices remain functional for extended periods. Therefore, you can easily integrate this mini PIR sensor into microcontrollers like Arduino, ESP8266, or Raspberry Pi to create responsive, motion-activated environments.

Key Features:

• Ultra-Compact Design: The miniature circular PCB and tiny Fresnel lens allow for installation in extremely tight spaces where standard sensors cannot fit.
• High Sensitivity: This module detects subtle infrared changes with high precision, ensuring reliable triggering even in complex environments.
• Automatic Reset: After a successful trigger, the output remains high for a fixed duration before resetting itself to wait for the next sensing event.
• Wide Voltage Range: The sensor operates efficiently across a broad supply range, accommodating various power sources from 3.3V to 15V.
• No Tuning Required: Unlike larger modules with potentiometers, this sensor comes pre-set for optimal performance, simplifying the deployment process.

Technical Specifications:

• Operating Voltage: 3.3 V to 15 V DC
• Static Current: < 20 μA (Ultra-low power idle state)
• Output Signal: Digital High/Low (3.3 V High level)
• Detection Distance: ≈ 3 meters to 5 meters
• Delay Time: Fixed at ≈ 2.5 seconds
• Blocking Time: ≈ 2 seconds (Prevents rapid repeated triggering)
• Operating Temperature: −20°C to +80°C

Mechanical Specifications:

• Lens Type: Miniature Fresnel Lens (White)
• Pin Interface: 3-pin header (2.54 mm pitch)
• Circuit Protection: Built-in voltage regulation for stable sensor logic.
• Installation: Through-hole mounting or direct wire soldering.

Dimensions:

• PCB Diameter: ≈ 13.5 mm
• Total Height: ≈ 13 mm (Including lens)
• Weight: ≈ 2 g (Extremely lightweight)

Pinout and Wiring:

• Pin 1 (VCC): Connect to the positive power supply (3.3V – 15V).
• Pin 2 (OUT): Connect to a digital input pin on your microcontroller (Outputs 3.3V upon detection).
• Pin 3 (GND): Connect to the common circuit ground (0V).
• Wiring Note: However, you must ensure a stable power supply, as voltage ripples can cause false triggers in highly sensitive PIR elements.

Datasheet Reference:

• Download MH-SR602 Motion Sensor Datasheet

Commonly Used in:

• Smart Home Automation: Automating lights, fans, or greeting systems when a person enters a room.
• Battery-Powered Security: Creating portable alarm systems or wildlife cameras that require minimal standby current.
• Interactive Exhibits: Triggering displays, sounds, or lighting effects in museums and retail kiosks.

Applications:

• Intrusion Alarms: Serving as the primary detection node in DIY home security networks.
• Automatic Lighting: Powering cabinet lights, hallway lamps, or under-bed nightlights.
• Energy Management: Turning off peripherals or monitors when no human presence is detected for a period.

Equivalent Models:

• HC-SR505: Another mini PIR module that offers a slightly larger cylindrical shape.
• AM312: A popular alternative with similar mini-lens characteristics and low power consumption.
• HC-SR501: The standard-sized PIR sensor; however, it is significantly larger and includes adjustable potentiometers.

Package Includes:

• 1 x MH-SR602 MINI Motion Sensor Detector Module