Description
Reviews
| 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 |
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.
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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