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PIR Motion Sensor w/Optional Thermistor + Light Sensor



PIR sensors are used to detect motion from humans or warm blooded animals. They can work from up to 5 meters away and sense infrared radiation as heat.

PIR sensors are active high and will output a 3.3V value when motion is detected. There are two knobs on the PIR sensor, one to adjust the sensitivity and one to adjust the duration of the output. The duration knob extends the duration from 5 seconds to 5 minutes. The sensitivity knob adjusts the sensitivity to increase the range. Be careful since if it's too sensitive, you'll get false positives and not sensitive enough means you'll miss motion events.

The sensitivity also fluctuates with temperature so they become more sensitive in cold weather and less sensitive in hot weather. To have more reliable and accurate sensing, we recommend adding the temperature sensor which compensates for temperature fluctuations.

There is also an option to add a light sensor which will convert the PIR sensor to dark-only mode. This means that it won't output anything unless it is dark outside.

They run on a minimum of 5V up to 12V supplies.

  • Shipping Weight: 0.05kg

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