PIR sensors (Passive Infrared Sensor) allow you to sense motion, almost always used to detect whether a human has moved in or out of the detection range. They are small, inexpensive, low-power, easy to use, and don't wear out. For these reasons, they are commonly found in appliances and gadgets used in homes or businesses, such as security systems, automatic doors, intelligent lighting, garden lights, guest reception monitors, etc.
The BM22S4221-1 is a low-power consumed PIR motion sensor, which is composed of a Fresnel lens, a PIR sensor, and an MCU. The Fresnel lens helps focus the PIR sensor's field of view. The BM22S4221-1 allows you to set the sensitivity, trigger time, and many other parameters so that you can tailor-fit it to your application.
When the product senses the motion, the output pin (pin 5) changes from low level to high level (default). It is easy to make a PIR detector by supplying power to this sensor and monitoring the output pin.
Product information
Dimension: 26 x 26 x 26.5 mm
Net Weight: 4.4g
