Handy for when you need to measure something far away, or in wet conditions. Because they are digital, you don't get any signal degradation even over long distances. They work great with any microcontroller using a single digital pin, and you can even connect multiple ones to the same pin, each one has a unique 64-bit ID burned in at the factory to...
This sensor allow you to detect if a human has moved in or out of the sensor range. They are small, inexpensive, low-power and easy to use. PIRs are basically made of a pyroelectric sensor which can detect levels of infrared radiation. Everything emits some low level radiation and the hotter something is, the more radiation is emitted. You can adjust...
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