The Mini AM312 PIR Motion Sensor Module is an ultra-compact, low-power human body infrared detection board designed for motion sensing, automatic lighting, security systems, and smart home applications. Built around the SC0322 PIR controller and a miniature pyroelectric infrared sensor, this module offers reliable motion detection in a footprint significantly smaller than the standard HC-SR501 — making it ideal for space-constrained designs, wearables, and portable devices.
At the heart of the module is the SC0322 PIR controller, a dedicated motion detection IC that processes signals from the pyroelectric sensor and outputs a digital signal when human motion is detected. The module operates from 2.7V to 12V DC, making it compatible with a wide range of power sources including 3.3V and 5V microcontroller systems, as well as higher voltage applications.
The miniature pyroelectric sensor detects changes in infrared radiation caused by moving human bodies. When motion is detected within the sensor’s field of view (typically 100° cone angle), the module outputs a HIGH signal on the OUT pin for a configurable duration. The detection range is approximately 3–5 meters, making it suitable for close-range motion sensing applications.
The ultra-low power consumption (typically 15µA in standby) makes this module ideal for battery-powered and energy-harvesting applications. It can operate for extended periods on small batteries, making it perfect for wireless sensors, portable alarms, and IoT devices.
The module features a compact form factor measuring approximately 12mm × 10mm, with a 3-pin interface (VCC, GND, OUT) for easy connection to microcontrollers. The fixed delay time (typically 2 seconds) simplifies integration, while some variants offer adjustable sensitivity and delay via onboard potentiometers.
The module is widely used in automatic lighting, security alarms, occupancy detection, smart home automation, wearable devices, battery-powered sensors, and DIY electronics projects. It is also popular in educational projects for teaching PIR sensing and motion detection principles.
Important Note: The AM312 module has a fixed delay time (typically 2 seconds) and may not offer the same adjustable range as the HC-SR501. For applications requiring adjustable delay and sensitivity, consider the HC-SR501. Ensure the power supply is within the 2.7V to 12V range.
Whether you are building a compact motion-activated device, a battery-powered security sensor, or a wearable motion detector, the Mini AM312 PIR Motion Sensor Module provides a reliable, ultra-compact solution. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or educational programs.
Features
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SC0322 PIR controller — Dedicated motion detection IC
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Ultra-compact form factor — Approximately 12mm × 10mm
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Miniature pyroelectric sensor — Reliable human body detection
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Wide operating voltage — 2.7V to 12V DC
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Ultra-low power consumption — Approximately 15µA standby current
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Digital output — HIGH signal on motion detection
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100° detection angle — Wide field of view
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3–5 meter detection range — Suitable for close-range sensing
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3-pin interface — VCC, GND, OUT for easy connection
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Wide application range — Automatic lighting, security, wearables, IoT, DIY projects
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Controller IC | SC0322 |
| 2 | Sensor Type | Pyroelectric infrared (PIR) |
| 3 | Operating Voltage | 2.7V – 12V DC |
| 4 | Standby Current | Approx. 15µA |
| 5 | Detection Angle | 100° (typical) |
| 6 | Detection Range | 3 – 5 meters |
| 7 | Output Signal | Digital HIGH on motion detection |
| 8 | Module Dimensions | Approx. 12mm × 10mm |
