The two halves are wired up so that they cancel each other out. The reason for that is that we are looking to detect motion (change) not average IR levels. The sensor in a motion detector is actually split in two halves. Everything emits some low level radiation, and the hotter something is, the more radiation is emitted. They are often referred to as PIR, "Passive Infrared", "Pyroelectric", or "IR motion" sensors.PIRs are basically made of a pyroelectric sensor (which you can see above as the round metal can with a rectangular crystal in the center), which can detect levels of infrared radiation. For that reason they are commonly found in appliances and gadgets used in homes or businesses. They are small, inexpensive, low-power, easy to use and don't wear out. Or you can git clone this project into the Arduino libraries folder e.g.Pyroelectric ("Passive") InfraRed sensors:'''What is a PIR sensor?'''PIR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. Get some inspiration from projects that were using this library and share your projects with the community.įor Arduino you can download the library as zip and call include Library -> zip library. To enable others to understand and reproduce your issue.įinally above all don't send me any e-mails or post questions on my personal website! Open issues only for bugs and if it is not a bug, use a discussion: Provide enough information about So please read the documentation first and check the issues and discussions before posting any new ones on Github. I spent a lot of time to provide a comprehensive and complete documentation.
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