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PIR Motion Sensor Module AM312

PIR Motion Sensor Module AM312

The AM312 PIR Motion Sensor is a compact passive infrared sensor designed for reliable motion detection in security systems and automation projects. It is optimized for low power operation and direct compatibility with modern microcontrollers such as ESP8266 and ESP32 using a 3.3V supply. Its stable performance, wide detection angle, and medium range sensing make it suitable for alarms, lighting control, and general presence detection applications.

Package Includes

  • PIR motion sensor module AM312 x 1

29.95 AED 29.95 AED (Tax included)

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Features

  • Wide operating voltage range from 2.7V to 12V
  • Low static current consumption below 0.1 mA
  • Digital output compatible with 3.3V logic levels
  • Two second output delay time after motion detection
  • Standalone operation without a microcontroller
  • Compatible with Arduino Raspberry Pi ESP8266 ESP32 and similar platforms
  • Detection angle up to 100 degrees
  • Motion detection range from 3 to 5 meters
  • Low cost and compact design
  • Simple three pin interface for easy integration

Specifications

  • Operating voltage: 2.7V to 12V
  • Logic output level: 3.3V high 0V low
  • Static current: less than 0.1 mA
  • Output delay time: 2 seconds
  • Lock time: 2 seconds default
  • Detection angle: approximately 100 degrees
  • Detection distance: 3 to 5 meters
  • Operating temperature: minus 20 C to plus 60 C
  • Module dimensions: approximately 31.5 mm x 24 mm

Principle of Work

The AM312 operates using passive infrared technology. It detects changes in infrared radiation caused by warm objects moving within its field of view. Internal sensing elements compare variations in infrared levels and generate a digital output signal when motion is detected. This signal can be read directly by digital input pins on microcontrollers to trigger programmed actions.

Applications

  • Security and intruder alarm systems
  • Automatic lighting control
  • Home and building automation
  • Occupancy sensing
  • Robotics obstacle and presence detection
  • Energy saving appliance control

Technical Notes

The AM312 does not require any external libraries for basic operation. It provides a simple digital output that can be monitored by any compatible controller or logic circuit. Proper placement and orientation improve detection accuracy and coverage.