AM312 Mini PIR Motion Sensor Module – Low Power Human Detector

AM312 Mini PIR Motion Sensor Module

Product Description

The AM312 Mini PIR Motion Sensor Module is a compact and low-power motion detection sensor designed to detect human movement using infrared radiation. Its small size, low power consumption, and digital output make it suitable for security systems, automation, wearable devices, toys, smart lighting, and battery-powered projects.

Compared with larger PIR modules such as the HC-SR501, the AM312 provides a compact fixed-parameter design without external sensitivity or delay adjustment controls. It is designed for simple plug-and-play motion detection.

Digital Motion Detection

The AM312 detects changes in infrared radiation caused by moving bodies within its sensing area. When motion is detected, the module produces a digital HIGH output, allowing a microcontroller to easily identify movement.

Its digital processing provides reliable motion detection and helps reduce unwanted triggers caused by electromagnetic interference.

Ultra-Low Power Operation

The module operates from a wide 2.7V–12V DC supply range and has a static power consumption of less than 0.1mA. This makes it suitable for battery-powered devices where low energy consumption is important.

Fixed Repeatable Trigger

The AM312 uses a repeatable trigger mode with a fixed delay of approximately 2 seconds. No manual adjustment is required, making the module simple to integrate into compact electronic projects.

Key Features

• Miniature PIR motion sensor
• Detects human movement through infrared radiation
• Ultra-low power consumption below 0.1mA
• Wide 2.7V–12V operating voltage
• Digital HIGH/LOW output
• Sensing range up to 3 meters
• Approximately 100° sensing angle
• Fixed 2-second delay
• Repeatable trigger mode
• Compact design
• Suitable for Arduino, ESP32, and Raspberry Pi projects
• No external sensitivity adjustment required

Technical Specifications

Feature	Specification
Model	AM312 Mini PIR
Operating Voltage	DC 2.7V – 12V
Static Power	<0.1mA
Sensing Range	≤3 Meters
Sensing Angle	≤100° Cone Angle
Delay Time	2 Seconds (Fixed)
Blocking Time	2 Seconds
Trigger Mode	Repeatable Trigger
Output Type	Digital HIGH/LOW
Dimensions	Approx. 10mm × 8mm Sensor Head

Working Principle

The AM312 uses a PIR (Passive Infrared) sensing element to detect changes in infrared radiation within its field of view. When a person or other warm moving object passes through the sensing area, the change in infrared energy is detected by the sensor.

The module processes the detected signal and provides a digital output to the connected controller. This allows the sensor to trigger lights, alarms, motors, notifications, or other electronic functions.

Output Interface

The sensor provides a simple digital motion-detection signal.

• HIGH: Motion detected
• LOW: No motion detected

This digital output can be connected to a compatible GPIO input on Arduino, ESP32, Raspberry Pi, or other suitable controllers.

Typical Application Scenarios

Security Systems

Suitable for motion-triggered alarms, compact security devices, and camera systems.

Smart Lighting

Can be used in closet lights, stair lights, corridor lighting, and other automatic lighting systems.

Wearable Devices

Its compact size and low power consumption make it suitable for wearable electronics and body-induction applications.

Toys

Can be integrated into toys to activate lights, sounds, or other effects when movement is detected.

Automation

Useful for battery-powered automation systems that require simple human-motion detection.

Applications

• Motion detection systems
• Security alarms
• Smart lighting
• Automatic closet lights
• Stair lighting
• Wearable electronics
• Smart toys
• Car security systems
• Compact camera systems
• Battery-powered devices
• Arduino projects
• ESP32 projects
• Raspberry Pi projects
• DIY automation
• IoT projects

Package Includes

• 1 × AM312 Mini PIR Motion Sensor Detector Module

Product Disclaimer

Product information provided on our website may not be entirely accurate as specifications can vary between manufacturers, suppliers, and production batches. Please verify the actual product specifications before using the module in critical applications.

Product images are for illustrative purposes only and may differ from the actual product in colour, component placement, dimensions, or other visual details.

This sensor is intended for general motion detection and should not be considered a standalone safety or security system for critical applications.

Important Note

Fixed Parameters

Unlike the HC-SR501, the AM312 does not include adjustable sensitivity or delay potentiometers. Its sensing parameters are fixed for simple and compact operation.

Power Supply

The module supports 2.7V–12V DC. Always ensure that the supplied voltage remains within the specified operating range.

Motion Detection

The sensor detects changes in infrared radiation caused by movement within its sensing field. Sensor performance can be affected by installation position, environmental conditions, and the movement of objects within the detection area.

Recommended Related Products

Explore relevant alternatives and complementary products selected from the full TechyTron catalogue.

• HC-SR501 PIR Motion Sensor Module