Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	AM312
Detection Type	Passive Infrared (PIR)
Operating Voltage	3.3V - 5V DC
Detection Distance	Up to 7 meters
Detection Angle	100 degrees cone
Output Signal	High level (3.3V) / Low level (0V)
Board Dimensions	23mm x 14mm x 10mm
Delay Time	Adjustable via potentiometer
Application	Motion detection, automatic lighting, security systems
Package Includes	1x AM312 Sensor Module

6 reviews

Anonymous

Mar 31, 2026

Rating: 4/5

Good value, compact size

Very compact and easy to integrate into tight spaces. It took a moment to calibrate the delay time correctly, but once set, it triggers reliably. Great price point for hobbyists.

Anonymous

Mar 30, 2026

Rating: 5/5

Perfect for Arduino projects

This little sensor works flawlessly with my Arduino Uno. The detection range is impressive for such a small size, and the sensitivity adjustment pot makes it very versatile. Highly recommended for DIY automation.

Anonymous

Mar 27, 2026

Rating: 5/5

Best mini PIR sensor

Compared to the larger HC-SR501, this AM312 is much easier to hide in custom enclosures. Sensitivity is excellent, picking up movement consistently from about 5 meters away in my tests.

Anonymous

Mar 21, 2026

Rating: 5/5

Reliable motion detection

I used three of these to create a hallway lighting system. They have been running for months without false triggers. The low power consumption is a huge plus for battery-operated setups.

Anonymous

Mar 17, 2026

Rating: 5/5

Easy to use for beginners

As someone new to electronics, I found this module very forgiving. The pinout is clearly marked, and plenty of tutorials exist online. It instantly lit up my LED when I walked by.

Anonymous

Mar 09, 2026

Rating: 4/5

Solid performance

Does exactly what it says on the tin. The detection angle is wide enough for doorways. Only minor issue is that the pins are a bit short for some breadboards, but easily solved with jumper wires.

5 FAQ

Q: What is the maximum current output of the signal pin?

A: The output pin provides a logic high signal (approx. 3.3V) but is not designed to drive high-current loads directly. You should use it to trigger a transistor, relay, or microcontroller input.

Q: How long does the output stay high after motion stops?

A: The duration is adjustable via the 'T' potentiometer on the rear of the board. It can typically be set anywhere from a few seconds to several minutes depending on your rotation.

Q: Can this sensor detect motion through glass or plastic?

A: Yes, infrared radiation can pass through materials like thin plastic and certain types of glass, though thick or treated glass may reduce sensitivity. For best results, ensure the lens has a clear line of sight.

Q: Is there a way to adjust the sensitivity?

A: Yes, there is a small potentiometer on the back of the board labeled 'S'. Turning it clockwise increases sensitivity, while counter-clockwise decreases it.

Q: Does this work with Raspberry Pi GPIO pins?

A: Absolutely. Since the module operates at 3.3V to 5V, it is fully compatible with Raspberry Pi GPIO pins. Just connect VCC to 5V or 3.3V, GND to GND, and OUT to a GPIO input pin.

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