Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	HC-SR312
Sensor Type	Pyroelectric Infrared (PIR)
Operating Voltage	3.0V - 5.0V DC
Detection Distance	Up to 7 meters
Detection Angle	Approx. 100 degrees cone
Output Signal	High level output (3.3V)
Dimensions	10mm x 10mm x 8mm
Delay Time	Adjustable via potentiometer
Operating Temperature	-20°C to +60°C
Application	Motion detection, security systems, automatic lighting

6 reviews

Anonymous

Mar 25, 2026

Rating: 5/5

Reliable motion detection

We used these in a batch of student robots. They consistently detect human presence without false alarms from pets.

Anonymous

Mar 18, 2026

Rating: 5/5

Perfect for compact projects

This sensor is incredibly small and fits perfectly into my wearable electronics project. The sensitivity is adjustable and works great indoors.

Anonymous

Mar 08, 2026

Rating: 5/5

Tiny but mighty

Don't let the size fool you. It has a decent range and responds quickly to movement. Easy to interface with Arduino.

Anonymous

Mar 06, 2026

Rating: 4/5

Great for learning

Bought this to learn about PIR sensors. Documentation could be better, but plenty of tutorials online helped me get it working.

Anonymous

Mar 03, 2026

Rating: 5/5

Exceeded expectations

Very low power consumption which is crucial for my battery-operated device. Highly recommended for portable applications.

Anonymous

Mar 02, 2026

Rating: 4/5

Good value but needs calibration

Works as expected once you spend time calibrating the potentiometer. Great price point for hobbyists.

5 FAQ

Q: Can this sensor work outdoors?

A: While it can function outdoors, direct sunlight and rapid temperature changes may affect accuracy. It is best suited for indoor or shaded environments.

Q: What is the current consumption in standby mode?

A: The module consumes less than 50uA in standby mode, making it ideal for battery-powered applications.

Q: Does this detect animals or just humans?

A: It detects heat signatures from any warm-blooded moving object. However, the lens is optimized for human-sized movement patterns.

Q: What microcontroller is compatible with this module?

A: The HC-SR312 outputs a 3.3V logic signal, making it compatible with Arduino, ESP8266, ESP32, Raspberry Pi, and most 3.3V or 5V microcontrollers.

Q: How do I adjust the detection delay?

A: There is a small potentiometer on the back of the module. Rotating it clockwise increases the delay time, while counter-clockwise decreases it.

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